Hi MN's my DS is now 23 weeks i have gone back to work part time so he is having two formula feeds per day.I BF in the morning and then when i return home he is back to BF , he is very happy and settled with this, i am confused with the follow on milk thing , as i exclusively BF my other children, and i dont remember there being follow on milks for 6 months onwards 16 yrs ago, anyway, I would like to know are these supposed to be used as well as the regular formula that i have been using or is it a step up that replaces it ?i currently use Heinz nurture 1, they have a 2 for hungrier babies and a 3 for 6mths onwards, i did read the tin but it doesn't make it very clear and i am not what you would call a confident expert when it comes to formula thanks