hello doctor, my child is now 21 days old now however my delivery was C-section,. so the day she was born, she was given nan-pro stage 1,formula milk, from next day I started feeding her,She was born with 2.65 as her weight, every one in the family suggest to give her nan-pro too along with my milk for her to gain weight, is it ok to give that milk too along with mine? if not now then when should I start her with formula milk