Hi mama! At 1 month, if you're breastfeeding exclusively, baby usually gets everything needed from your milk na, pero definitely check with your pediatrician kasi they'll know best kung may vitamin D or iron supplement na kailangan ng baby based sa feeding plan at health. A few of us moms found na ang pedia talaga ang best guide dito since every baby's different, so don't worry, just ask during your next check-up!