Week old babies poop is really runny and yellow

Ash • Mom of a 2 yr old Landon❤ Pregnant with 🌈baby.

She is pushing so hard to poop and it is very runny and yellow like mustard. Is this normal? She haven’t pooped in a while and now it’s just like diarrhea. She is formula and breast fed. She is pooping almost non stop for 5 min