my view = that is a healthy weight so i wouldnt worry too much about it at this stage... if he doesnt seem hungry or dehydrated and is putting on some weight then dont stress yourself about it at this stage.. i dont think most nurses care too much about the charts but 50% is obviously average so he is doing well even if you do follow the charts... be kind to yourself you are obv doing a good job and he is thriving... so give him some EBM or another feed if you think he needs it and then see how things go.. obviosuly this is my view only but all these numbers can just make us feel stressed etc when really if bubs is growing and doing well then sit back and enjoy...