Hoping someone can help me!
My little boy is 6 months old, and I've fed him 5oz of formula that he had left over from 11pm. DH did the feed and had left the bottle out rather than chucking it, and I just picked the wrong one up. Didn't realise until he'd drained it and I thought "that went fast!" as he normally has 8oz in the morning, then saw the fresh bottle I'd just made sitting on the chest of drawers. 
I don't know what I'm posting this for, but I'm absolutely shitting myself here. I only started formula feeding a month ago & have been so meticulous! Has anyone else done this, was your baby ok? Presumably I need to watch for diarrhoea/vomiting? Anything else?