Due to lots of breastfeeding issues I had to supplement meals with formula. I stared with C & G first formula but baby was fussy, crying lots and sometimes projectile vomiting. A friend recommended we try comfort milk. We're on day three now and he hasn't poo'd. He keeps farting and straining for a poo. We've been doing bicycle legs, belly massages and giving him cooled boiled water. Is it normal for this to happen whilst his belly adjusts to a new milk? Should we just carry on rather than chopping and changing? I've been giving some infacol before each feed to try and get trapped gas out. He's 8 weeks old.