My newborn hasn't pooped at all today. what should i do?

Usually normal but..: Poops can happen after every feeding, but they can also happen every few days (up to 10 in a breast fed child), and frequency can change at random. The child's mood, appetite, weight gain, urine output, and other factors are more important than poop frequency in determining the level of concern.

Wait and watch: Many newborns have infrequent bowel movements. As long as your infant is feeding well, urinating frequently and seems comfortable, you can wait and watch to see what happens. If your infant doesn't have a bowel movement for more than 72 hours or is irritable, feeding poorly or not having wet diapers, you should call your pediatrician.

Depends: If it's within the first few weeks of life, stool output is one way to tell if baby's getting enough to eat-- so you'd want to think about if nursing is going well, and you may need to contact your pediatrician to go through more-specific questions. Past 2 weeks or so, many breast-fed babies who are nursing great and gaining weight well will start to go longer without stool, and it can be normal.

Infant stooling: Again, the question is better answered knowing how old is the infant. If indeed a newborn, it should be having more then one stool per day. However, it is still common for child who are breastfed to go multiple days without stool. Is child having distended belly, less food intake or vomiting - these would be concerning for GI issues. Please see your pediatrician if concerned.

Can be normal: Newborns can have a bowel movement every feeding, 1-2 per day, or once every 2-3 days. As long as it is soft (usually close to "thick soup"), it can be considered normal. If she is having hard stools or seems very fussy, check with your doctor.