Infant Constipation:(

My babygirl is 8 months now but has struggled with constipation since she was a newborn.

She has hard stool. Doctor perscribed Lactalose to put in her bottle 2 times a day. She drinks Nutramigen Cows Milk Allergy Milk because they think she might have a cows milk alergy because when she was a newborn she vommited ALL of her milk after every feeding.

Nutramigen helped w the vommiting but not the constipation. Lactalose is the only way she can poop normal.

She has tried Emfamil Gentlease as a newborn and it just didnt work at all. Emfamil Reguline & Infant still didnt help with constipation.

She's been eating babyfood for a few months now prums, plums, pears, peaches, peas, bananas, sweet potato and much more.

Wic wants us to try Soy Milk so today she is starting Gerber Good Start SOY i guess its more natural w no cows milk and ingredients thats in regular formula.

I just want my baby to be able to poop on her own normal without medication...Any recommendations?