My babies breath smells like poop and she is constipated could she have hirschsprungs disease

See below: Highly unlikely. And, constipation would not alter the way your child's breath smells. Discuss with your doctor.

Consult Pediatrician: You did not say how old your baby is.With the symptoms you described i will check with your babies pediatrician, he will be able to tell you what it may be. Hirschsprung disese symptoms usually start after the baby is born and if it is a mild condition it may not show up later. So take your child to the pediatrician.