Overview
Babies usually regain birth weight by 2 weeks.
Sleepiness at feeds can be from jaundice.
Symptoms
Common signs:
- Baby not feeding well
Less common
- Fewer wet diapers
- Sleepy baby
- Fussy at feeds
When to get medical care
Call 911A baby who is limp, hard to wake, struggling to breathe, or has blue or gray lips: call 911.
Get care todayFew wet diapers, very sleepy, or yellow skin.
See a doctor soonSlow weight gain.
Causes
Latch, reflux, illness.
Does it spread or run in families?
- It isn't contagious. You can't catch it from someone else.
Who is more likely to get it
- Premature babies
Possible complications
Diagnosis
Weight and feeding checks.
Questions you may be asked
- Feeds, diapers
The exam
Full exam.
Tests
Tests, if needed:
- Blood or urine tests: Sometimes.
Treatment
Track and get help.
Self-care
- Count wet and dirty diapers
- Feed 8 to 12 times a day
- Wake a sleepy newborn to feed
Prevention
To lower your risk or prevent problems:
- Early feeding support
Which doctor treats this
- Start with your child's pediatrician.
Children, pregnancy, and older adults
- Breastfed babies: Watch latch and diapers.
For caregivers
- Learn the warning signs and when to call the doctor or 911.
- Keep a list of your child's medicines, doses, and doctors on your phone.
- Tell teachers, coaches, and sitters what to watch for and what to do.
- Take breaks and ask for help. Caregivers need care too.
Outlook
Fixable.
Most babies catch up quickly.
Getting ready for your visit
Bring a list of your symptoms and medicines.
Questions to ask
- Do we need a lactation consultant?
Research studies
Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.
Search ClinicalTrials.gov for studies on Baby not feeding well or not gaining weight
Sources
Last updated 2026-11-12.