My mother just called... LO is 6 months old, I have been pumping since he was 7 weeks. She went to heat up a bottle today (pumped yesterday) and baby refused it. She noticed that it was "curdling". She said it smells bad. She tried another bottle, same results and baby will not eat it. She sent me pics and it looks like the fatty part of the milk is curdling. So am I dealing with lipase here? I so hope not, but it really sounds like it.
This milk was between 12-24 hours old. I have some frozen too, but so far that seems ok although LO does not care for frozen milk. He will eat it, but you can tell her prefers not to.