One and half month at these picture my little boy, i breastfeeding about one week after on that trial of breasfeeding it didn't work's. has no enough milk on me then i been sick for couple of days due to the (CS) when i give birth.. but he's good in formula, bottle milk which is very good, he's gain more weight Month and month. one and half month baby could start smile, hear the parents talking, recognize the toys. but baby are different stages. for him every month i could have a list in calendar with his growing up in that way we would know about his growing stage.