The Evidence on Breastfeeding Basics, Without the Hype

Key takeaways

• Exclusive breastfeeding: about the first 6 months, per AAP
• Continued breastfeeding: alongside solid foods for 2 years or beyond, as long as parent and baby wish
• Most useful single change: Hold your baby skin to skin soon after birth and feed when you see early hunger cues such as rooting or hands to mouth.
• Commonest mistake: Putting up with pain at every feed; it usually means the latch needs adjusting.
• See a doctor if any of the signs under "When to speak to a doctor" below apply to you.

What it is

Feeding a baby human milk directly from the breast or by bottle after pumping. It sits within Pregnancy. What follows are the published numbers, not the ones that get passed around.

The numbers, in one place

What helps

What follows is the practical part: the things guidance actually asks of you.

• Hold your baby skin to skin soon after birth and feed when you see early hunger cues such as rooting or hands to mouth
• Ask for help with latch from a nurse, a lactation consultant (IBCLC) or WIC breastfeeding staff
• Count wet and dirty diapers in the first week and bring the count to your baby's first checkup
• Check with a doctor or pharmacist before taking a new medicine while breastfeeding
• Ask your employer about break time and a private space to pump, which federal law requires for most employees

What to avoid

The common mistakes, including the ones that sound sensible.

• Putting up with pain at every feed; it usually means the latch needs adjusting
• Giving water or juice to a baby under 6 months
• Falling asleep with the baby on a sofa or armchair

In depth

Milk supply works largely on demand. When a baby feeds or milk is removed by a pump, hormones signal the breast to make more. Prolactin drives milk production, and oxytocin causes the let-down reflex that pushes milk toward the nipple. The more often and more fully milk is removed, especially in the early weeks, the more milk is made. This is why frequent feeding in the first days is so important.

The first milk, colostrum, is thick and produced in small amounts, which matches a newborn's tiny stomach. It is rich in antibodies and helps the baby pass the first stools. Over the next few days, milk volume increases noticeably, and the milk changes in composition. Feeling full, warm or heavy is a sign of this transition.

Breastfeeding is a learned skill for both parent and baby, and early difficulties are very common. Pain, latch problems, worries about supply and slow weight gain often respond well to skilled help. Feeding can also be exclusive breastfeeding, combined with formula, or entirely pumped milk; every amount of human milk offers benefits.

Signs and symptoms

• Early hunger cues such as stirring, rooting, licking lips or hands to mouth
• Rhythmic sucking and swallowing during feeds
• A baby who seems relaxed and content after most feeds
• An increasing number of wet and dirty diapers over the first week
• Sore, cracked nipples or pain during feeds, which suggest a latch problem
• A hard, red, painful area of the breast, sometimes with fever

Causes and risk factors

• A shallow latch, which causes pain and less efficient milk removal
• Infrequent feeds, long gaps or early use of formula without pumping
• Tongue-tie or other oral issues in the baby
• Medical conditions such as thyroid problems, PCOS or previous breast surgery
• Some medicines and hormonal birth control methods that may affect supply
• Separation from the baby after birth and returning to work without a pumping plan

How it is checked

In the hospital and at early checkups, nurses and the baby's doctor watch a feed, check the latch and weigh the baby. Newborns typically lose some weight in the first days and regain it by about two weeks. The baby's weight, wet and dirty diapers and jaundice level are the main ways to judge whether feeding is going well.

An International Board Certified Lactation Consultant (IBCLC) can assess positioning, latch, milk transfer and the baby's mouth, and may weigh the baby before and after a feed to estimate how much was taken. Breast pain with fever is evaluated by your own provider, who may check for mastitis or an abscess.

Treatment and support options

Improving the latch

A good latch takes in a large mouthful of breast, not just the nipple, with the baby's chin pressed into the breast and lips flanged outward. Trying different holds, such as football hold or laid-back positions, can help. If pain persists beyond the first few sucks, gently break the suction with a finger and try again.

Pumping and storing milk

A pump can help maintain supply when you are separated from the baby, build a stored supply before returning to work, or feed a baby who cannot latch. Many health plans cover a breast pump. Follow CDC guidance on storing milk safely, labeling containers with the date and using older milk first.

Combination feeding

Some families combine breast milk and formula because of supply, medical needs, work or personal choice. If you want to protect your supply, pumping when the baby has formula can help. Your pediatrician and a lactation consultant can help you find a balance that works.

Treating breast problems

Engorgement often improves with frequent feeding, cold packs and gentle lymphatic massage. Mastitis may need antibiotics. Continuing to feed or pump from the affected side is generally safe and helps it resolve, but follow your provider's advice.

Prevention

• Take a breastfeeding class during pregnancy and learn about hunger cues
• Keep the baby skin to skin and room in after birth when possible
• Ask for lactation help in the hospital before you go home
• Plan for pumping at work, including space, time and equipment
• Avoid tight bras and long gaps between feeds in the early weeks

Day to day

Early weeks often involve cluster feeding, when a baby feeds very frequently for a few hours, often in the evening. This is normal and helps build supply. Keep water and snacks within reach of your feeding spot, and share other tasks so you can rest.

Returning to work or school usually requires planning. Talk to your employer about pumping breaks, practice with a pump and bottle a couple of weeks ahead, and learn how to store and transport milk safely. Many people find that a routine of pumping at the same times each day helps keep supply steady.

For specific groups

Premature or NICU babies

Human milk is especially valuable for premature babies. If your baby cannot feed directly, starting to pump soon after birth and pumping often builds supply. The NICU team and lactation staff can help with pumping and the transition to breastfeeding.

People taking medicines

Most medicines are compatible with breastfeeding, but a few are not. The NIH LactMed database is a resource clinicians use. Always ask your doctor or pharmacist before starting or stopping a medicine.

Twins

Many parents successfully breastfeed twins, sometimes feeding both at once with a special pillow. Supply often responds to demand from two babies. Extra support with positioning and household help makes a big difference.

Questions to ask your doctor

• How can I tell my baby is getting enough milk?
• Can you refer me to a lactation consultant, and is it covered?
• Are my medicines safe while breastfeeding?
• Which birth control methods are best while breastfeeding?
• What should I do if I think I have mastitis?

More questions, answered

How do I know my baby is getting enough?

Steady weight gain after the first days, enough wet and dirty diapers, and a baby who seems satisfied after most feeds are the main signs. Breast fullness and how much you can pump are not reliable measures. Your baby's doctor will track weight at checkups.

Is it normal for breastfeeding to hurt?

Some tenderness in the first days is common, but ongoing pain, cracked or bleeding nipples, or pain throughout feeds usually means the latch needs adjusting. Get help early rather than putting up with it.

Can breastfeeding work as birth control?

The lactational amenorrhea method can prevent pregnancy only under strict conditions: exclusive breastfeeding day and night, periods not yet returned, and the baby under 6 months. Many people prefer an additional method. Discuss options with your provider.

What if I cannot breastfeed or choose not to?

Infant formula provides complete nutrition for babies. Feeding choices are personal and influenced by health, work and circumstances. Your baby's doctor can help you choose a formula and prepare it safely.

How long can I store breast milk?

CDC guidance gives times for room temperature, refrigerator and freezer storage. Freshly expressed milk keeps for a few hours at room temperature, several days in the refrigerator and months in the freezer. Check the CDC chart and use older milk first.

Can I breastfeed when I am sick?

In most common illnesses, such as colds and flu, continuing to breastfeed is recommended and can pass antibodies to the baby. Wash your hands and consider a mask. Ask your provider about any medicines.

Related topics

• Breast Cancer: Sorting the Evidence From the Noise (Cancer Awareness)
• Safe Sleep for Infants: Sorting the Evidence From the Noise (Injury Prevention)
• Childhood Nutrition: Sorting the Evidence From the Noise (Children's Health)
• RSV (Respiratory Syncytial Virus): Sorting the Evidence From the Noise (Infectious Diseases)

Where to go next

• Breastfeeding Basics: A Beginner-Friendly Start
• Breastfeeding Basics: Common Questions Answered
• Breastfeeding Basics — the reference entry
• Pregnancy and Postpartum: The Complete Guide
• What the Guidance Really Says About Postpartum Checkups
• The Evidence on Prenatal Care Schedule, Without the Hype

When to speak to a doctor

Call your baby's doctor if the baby has few wet diapers, is very sleepy and hard to wake for feeds, or looks more yellow, and call your own provider for a hot, red, painful area on the breast with fever. Call 911 if the baby is limp, turning blue or struggling to breathe.

Where this comes from

• American Academy of Pediatrics — Breastfeeding and the Use of Human Milk
• CDC — About Breastfeeding

How this page was put together

Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarized or generalized beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.

Medical disclaimer

This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to your doctor, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 911.