My baby is almost 3 weeks old and I'm not sure if any milk has come in yet :( how would I know? I do try and breastfeed him 90% of the time. (having to combination feed a bit as he was so big and can't sustain himself and breastfeeding isn't enough. My breasts don't leak, they're not bigger, I can't hear him gulp, nothing :( I don't think he's getting anything. Weight loss is slowly creeping back up from birth but not enough :( any advice?