Enfamama maternity milk chocolate

Hi any reviews on enfamama maternity milk chocolate flavour? Will it make u gain weight easily. Currently 4 months. And I realize I have gain 7 kg in one month. I don't really eat much, just the usual meal. Snack on fruits. Only during weekends sometimes cake. The only thing I drink every night is Meiji fresh milk. I suspect the weight gain is due to the milk. Thinking of switching to enfamama chocolate.