What Newborn Poop Color Means — A Day-by-Day Guide

Newborn poop is one of the weirdest things first-time parents see. It changes color, texture, and smell several times in the first week. Here is what each shift means.

Newborn Poop, Day by Day

• Days 1–3: Black, sticky, tar-like (meconium). This is the first poop and it is supposed to look terrifying.
• Days 3–5: Greenish-brown, transitioning. Less sticky.
• Day 5+ (breastfed): Yellow, seedy, mustardy. May smell sweet.
• Day 5+ (formula-fed): Tan/yellow, paste-like. Smells more like adult stool.

Frequency

This varies wildly. Some breastfed babies poop after every feed. Others go several days between poops. Both are normal IF baby is otherwise comfortable, gaining weight, and feeding well.

When to Call the Pediatrician

Diaper output is also how you know baby is eating enough. If you want a complete day-by-day chart of expected wet and dirty diapers in the first week — plus everything else for the first 90 days — see our newborn survival guide.

• Red blood streaks in poop
• Pure white or chalky poop (could indicate liver issue)
• Watery, explosive diarrhea (more than usual)
• Hard, pellet-like poop (could indicate dehydration or constipation)
• No poop at all for 5+ days, especially with fussiness or hard belly