Hey mama! Kami naman nag-try ng transition from Similac to Nido at honestly smooth lang siya, pero ang key talaga ay gradual, mixed ko muna ng konti ang bagong brand with the old one for about a week bago full switch para hindi upset ang tummy ng baby. A few of us in our mommy group also tried Lactum and Nido both, at parehong okay naman depending sa baby, some kids thrive sa Nido, iba sa Lactum, so it's really trial and error, pero wala kaming major issues kung ginawa naming maayos ang transition at hindi biglaan. Good luck sa transition, mama!