Hi, good on you for keeping up the breastfeeding, i know it can be hard at first but it's great when they are so healthy because of it. my little chicken was 8.12kg at 4mths and fully breastfeed also, but as time has gone on she has started to slow down the weight gain, but she is still quite large - 10.7kg at 10mths. Definately must be something in our booby juice alright as Emily was born 3.175kg.