Possible constipation and not eating

Eryn

My 4 month old girl hasn't pooped in now 3 days. She has been eating well at least 26 to 28 oz a day, 4 to 5 oz a feeding. But today she only took 21 oz. with sometimes only 2.5 oz a feeding

I've tried cycling legs, warm bath.... tried to give her pureed prunes...she didn't like them.

Have anyone dealt with this?