DS1 had it and his symptoms started at 3-4 weeks old.
I went off dairy and soy (except for soy bean oil and traces) for a week before DS2 was born and had been eating it sparingly for 4 weeks prior.
DS2 is now 6 days old and has been having dry green stringy/mucous poops for 24 hours. He's nrsing well, happy and no vomitting. Our midwife said watch and wait since he's only lost 2% of his weight, I'm already restricting and he's so young,which I agree with.
I'm just wondering how early symptoms started in other LO's.