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Managing Poor Weight Gain in Your Breastfed Baby

We understand gender is a spectrum. We may use gendered terms to talk about anatomy and health risk. Please use this information in a way that works best for you and your provider as you talk about your care.

Sometimes breastfed babies will gain weight more slowly than they should. This could be because the mother isn't making enough milk, or the baby can't get enough milk out of the breast. Or it could be that the baby may have a health problem. Your baby's doctor will assess why your baby isn't gaining weight. Often, a certified lactation consultant can help. Below are some tips for dealing with poor weight gain in a breastfed baby.

Check the schedule 

  • Watch for signs from your baby that they want to feed. Your baby should wake and "cue" to breastfeed about 8 to 12 times in 24 hours. Your baby will cue by rooting, making licking or sucking motions, bobbing their head, or bringing their hand to their face or mouth. It's important for you to understand these feeding cues and to put your baby to your breast when they cue. Don't wait for your baby to cry. Crying is a late feeding cue. Often a baby latches and breastfeeds better if they don't have to wait until they are crying, frustrated, or too tired to feed. Putting a baby off to try to get them to go longer between feedings is often linked to poor weight gain. And so is frequently offering a pacifier instead of the breast when a baby shows feeding cues.

  • For many mothers, milk production increases and babies' weight gains improve if the mother can breastfeed nearly around the clock for a few days. When a baby is not breastfeeding, the mother holds them skin-to-skin on the chest. This can make you more sensitive to your baby's feeding cues.

  • Your baby may be a "sleepy" baby who does not cue to feed at least 8 times in 24 hours. Then you will have to wake your baby to feed frequently—about every 2 hours during the daytime and evening and at least every 3 to 4 hours at night. You will need to do this until weight gain improves.

  • It can help to write down when your baby nurses, on which side, and for how long. Keep track of this for a full 24 hours, if not longer. Take this record to your doctor or lactation consultant. They can help you find and fix the problem. 

Latching and positioning

While baby is latched on right nipple, left hand massages breast tissue towards nipple and baby's latched mouth.

  • Be sure that your baby is mainly uncovered during breastfeeding. A baby that is bundled papoose-style may get too warm and comfy. They are more likely to doze off during feedings. If there is a chill in the air, drape a sheet or light blanket over you and your baby as needed.

  • If your baby falls asleep within minutes of latching, massage your breast as they nurse. This can provide a burst of milk and re-trigger sucking. You can do this by stroking downward and inward on the breast.

  • Make sure your baby is latching correctly. The latch should be comfortable to you. Your baby's lips should be flanged outward like "fish lips." The tongue should be under your breast. A large amount of your breast tissue should be in the baby's mouth.

  • In general, don't do "switch nursing." That is when your baby breastfeeds at one breast for a few minutes, then the other breast, and then back. This may interfere with your baby getting enough of the calorie-rich hindmilk. Your baby gets more hindmilk as a feeding continues on one breast. But the switch strategy sometimes stimulates the sleepy baby, so they wake up and start sucking again.

If your doctor recommends supplementing

  • Use your own expressed milk first for any alternative feedings.

  • Use an alternative feeding method if it's recommended by your doctor or an IBCLC, a lactation consultant certified by the International Board of Lactation Consultant Examiners. There are many alternative feeding options, so let them know if a recommendation does not feel right for you. Alternative feeding methods include:

    • Cup feeding.

    • A tube system with a special feeding tube taped to the breast or a finger (supplemental nursing system, or SNS).

    • Syringe feeding.

    • An eyedropper.

    • Spoon-feeding.

    • Bottle-feeding.

  • Several methods require help from a professional so you can use them correctly. Depending on your baby and the cause of the problem, some methods may work better than others. Also discuss bottle nipple type with the consultant if you bottle-feed any supplement. Some types of bottle nipples are less likely to interfere with breastfeeding than others.

Maintaining or increasing your milk supply

Mother sitting to breastfeed baby on one breast and pump milk on other breast.

  • Pump your breasts after as many daily breastfeedings as possible. This is even more important if you are not sure if your baby is effectively removing milk during breastfeeding. You may find that trying 8 times a day is manageable. You also may find it helpful for your milk supply. 

  • Pumping will remove milk well, so your breasts will know to make more milk. Pumping will also express extra milk for feeds. Milk can be removed from the breast by manual hand expression, a hand pump, a battery-powered pump, or an electric breast pump. Use a double-electric or hospital-grade pump to help manage poor weight gain in a breastfed baby. 

Checking baby's weight

Your baby should be weighed often. Keep weighing your baby until they are gaining weight at a good rate. Digital scales are available that allow a doctor or a certified lactation consultant to get precise pre- and post-feeding weights. This lets the provider measure how much milk a baby takes in during a particular breastfeeding. This can be helpful. But babies take in different amounts at different feedings during a 24-hour period. So a provider may suggest that parents rent this type of scale. Then the baby can be weighed before and after feedings. The doctor also may suggest recording only a daily or weekly weight, depending on the situation.

Contact your baby's doctor

If your baby ever shows signs of dehydration, contact your baby's doctor right away. Some signs of dehydration in a baby include:

  • Fewer stools and wet diapers than normal.

  • Dry lips.

  • Sunken fontanelle (soft spot).

  • Dark circles around the eyes.

  • Seeming more tired than normal.

In some cases, breastfeeding is going well, but the baby still is not gaining enough weight. Then it is likely that something else is affecting milk production or feeding. Always talk with your doctor and your baby's doctor.

Online Medical Reviewer: Daphne Pierce-Smith RN MSN
Online Medical Reviewer: Lalitha Kadali Researcher
Online Medical Reviewer: Raymond Turley Jr PA-C
Date Last Reviewed: 6/1/2025
© 2000-2025 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare professional's instructions.