Ah, formula switching! Yan talaga common dilemma ng atin dito, a few of us have done the Enfamil to Nestogen switch, and honestly parang okay lang if you do it gradually, maybe mixing both for a few days bago full switch para hindi magulat ang baby's tummy. Best to check with your pedia though para sure sa baby ninyo specifically, especially if may sensitive stomach or allergies, kasi different babies react differently sa formula changes!