Formula helping them sleep is a load of bull, DD was FF from 2 weeks old and didn't sleep thru til 17 months.
I think it helps alot of mums to talk about sleep (or lack of) some mums find it gives them a sense of self worth telling someone else that their baby sleeps thru (like a PP said, that that means they're doing a good job) and whingeing gives you some sympathy from someone else if just for a moment.
Sleep deprivation was the main cause I was put in the MBU.