Don't compare of other babies, as long as your babies healthy eat well, is enough. For my baby girl she now almost 1 year old, she is tiny as well and everytime I weight her, health vista said she is underweight and my mum keep ask me to change formula milk and curious me not enough milk to baby, of course I ignore her comment la, apart of weight, my baby everything alright, probably I"m tiny that's why my baby tiny as well. Don't worry too much you do the best to your baby la. I"m happy I fully breastfeed my baby girl almost 1 year la yeah!! I can do that I'm sure you can.