Aimees always been on the skinny side and i'm used to her not gaining much weight but she was weighed yesterday for the first time in over a month and she had lost 6oz. I know its not much and HV wasn't worried but it still bothers me. She hasn't been ill in that time but she did go on cows milk around that time. Do you think that could be the cause. She now only weighs 18lb 11oz!