Hi. My baby is almost two months old. I tried 2 sorts of formula milk and then isomal 1 worked, she was not constipated anymore and her poo was perfect for about 3 weeks. Now she is constipated for 2 weeks long.. her poo is hard and i must help her to poo. Yesterday there were blood on her poo on the outside. Must i change her milk to lactogen? I just can not understand why her poo was right in the beginning and now suddenly she struggle to poo and the poo is very hard. She also struggle to go sleep at night.. every night she goes to sleep at 2 or 3 am!! During the day she is ok and very happy but at night she is crying and do not want to go sleep. Please help. Thank you.