Colic vs Reflux: Key Differences
Content reviewed against published AAP, AAP, NICE guidelines
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Both colic and reflux cause crying and fussiness in young infants, making them difficult to distinguish. Colic is defined by excessive crying with no identifiable cause, while reflux involves stomach contents flowing back up the esophagus.
Key takeaways
- Colic crying is worst in the evening; reflux fussiness is tied to feeding times
- Reflux involves visible spitting up or wet burps; colic does not
- Back-arching during feeds suggests reflux; drawing up legs and clenching suggests colic
- Colic resolves by 3-4 months; reflux may persist until 12-18 months
: Definition
Colic: Excessive crying (3+ hours/day, 3+ days/week) in a healthy infant
Infant Reflux (GER/GERD): Stomach contents flowing back into esophagus
: Timing
Colic: Worst in late afternoon/evening ("witching hour")
Infant Reflux (GER/GERD): During or shortly after feeds; when lying flat
: Relationship to feeding
Colic: Crying not specifically related to feeds
Infant Reflux (GER/GERD): Spitting up during/after feeds; may arch back while feeding
: Spitting up
Colic: May have normal spit-up but not excessive
Infant Reflux (GER/GERD): Frequent, sometimes large volume spitting up
: Weight gain
Colic: Normal weight gain
Infant Reflux (GER/GERD): Usually normal ("happy spitter"); poor gain in severe GERD
: Body position
Colic: Drawing up legs, clenched fists, tense abdomen
Infant Reflux (GER/GERD): Arching back, turning head (trying to relieve discomfort)
: Age
Colic: Starts around 2-3 weeks; peaks at 6 weeks; resolves by 3-4 months
Infant Reflux (GER/GERD): Starts in first weeks; peaks at 4 months; resolves by 12-18 months
: Pattern
Colic: Predictable daily episodes; fine between crying bouts
Infant Reflux (GER/GERD): Related to feeds throughout the day
: Treatment
Colic: Soothing techniques (5 S's), time; no effective medication
Infant Reflux (GER/GERD): Smaller/frequent feeds, upright positioning, thickened feeds; medication if severe
: Sleep
Colic: May sleep well once episode passes
Infant Reflux (GER/GERD): Often disrupted sleep due to lying-flat position worsening reflux
| Colic | Infant Reflux (GER/GERD) | |
|---|---|---|
| Definition | Excessive crying (3+ hours/day, 3+ days/week) in a healthy infant | Stomach contents flowing back into esophagus |
| Timing | Worst in late afternoon/evening ("witching hour") | During or shortly after feeds; when lying flat |
| Relationship to feeding | Crying not specifically related to feeds | Spitting up during/after feeds; may arch back while feeding |
| Spitting up | May have normal spit-up but not excessive | Frequent, sometimes large volume spitting up |
| Weight gain | Normal weight gain | Usually normal ("happy spitter"); poor gain in severe GERD |
| Body position | Drawing up legs, clenched fists, tense abdomen | Arching back, turning head (trying to relieve discomfort) |
| Age | Starts around 2-3 weeks; peaks at 6 weeks; resolves by 3-4 months | Starts in first weeks; peaks at 4 months; resolves by 12-18 months |
| Pattern | Predictable daily episodes; fine between crying bouts | Related to feeds throughout the day |
| Treatment | Soothing techniques (5 S's), time; no effective medication | Smaller/frequent feeds, upright positioning, thickened feeds; medication if severe |
| Sleep | May sleep well once episode passes | Often disrupted sleep due to lying-flat position worsening reflux |
When to Worry
- Poor weight gain or weight loss (suggests significant GERD, not simple colic)
- Projectile vomiting in a baby aged 2-8 weeks (possible pyloric stenosis — emergency)
- Green (bilious) vomiting (never normal — seek immediate care)
- Blood in spit-up or stool
- Refusing all feeds or unable to feed
- Crying with fever, rash, or other signs of illness (not colic)
- Excessive crying with bulging fontanelle or inconsolability (other serious causes)
Frequently asked questions
What is the main difference between Colic and Infant Reflux (GER/GERD)?
How can I tell if my baby has Colic or Infant Reflux (GER/GERD)?
When should I worry?
Sources
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources
Bottom line
Both Colic and Infant Reflux (GER/GERD) are common in young children. The key differences in symptoms can help you identify what your child may have, but when in doubt, consult your pediatrician.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.