My baby is gaining his weight very slow and not that noticeable.He is 4,5 months young and weights about 5650 kg,do not know his height though.He looks tall and slim like his daddy,also quite active.Doctor said i have to add formula in his nutrition plan,which i did.But still haven't noticed a big change.I also give him a bit of fruit puree.Maybe this is due to learning new skills(turning) or teething(lots of saliva and swallen gums,however nothing like teeth yet).Anyone having same situation?