Hi Sir/Madam As my son is preterm baby age 1 month 22 days have born at 34 weeks, weight 2.200, he was in NICU for 23 days and at discharge time his weight is 1.800, we use to give him formula milk pre Nun, now today his weight is 2.800. My question is that which formula milk is best after pre nun we can give nan pro or can we change to lactodex or aptamil or any other best brands for baby growth