Hi all. I am using cow and gate ready made formula (RMF) at the moment for my 3 week old. He is starting to finish his bottle and want more…can I add more RMF to the bottle he was already drinking from or do I need to get a new sterilised bottle for his top up? Midwife seemed to think it was fine to add more RMF to original bottle but I’m sure I read somewhere that’s it’s not! Thanks.