My son was taking bottles fine and now that he is 8 weeks old and I am preparing to go back to work he is fussing at the bottle that he gets once a day. I have been reading about lipase issues on here and am wondering how I know if that is the problem or not. Is there some way to tell...I have read about a soapy/sour smell and I dont really smell that when the milk is defrosted but we also do not heat the bottles up we just warm the milk in warm water before giving them to LO. Any advice or help you ladies can give me I would appreciate it. I have a large freezer stash and if this is a problem then I need to start rebuilding a good stash now since i will be returning to work next month. Thank you in advance!