my daughter is a week old today and yesterday at her check up they switched her formula from enfamil newborn to enfamil prosobee because she had been spitting up after every feeding. She weighed 7.6 at birth, 7.4 when we left the hospital and 7 lb at her appt yesterday. I started the new formula at her next feeding and she has actually been spitting up more. Should i switch back? She was keeping more down on the regular milk based formula than lactose free, soy based formula.