Don't think it matters tbh... I've seen plenty of mothers on here complaining that their babies don't sleep through and they are formula fed and weaned. And in the first few weeks you learn to survive on little sleep because all babies wake lots to be fed, you just get used to it
. You can choose to bottle feed which means having to get out of bed, warm the bottle up, feed it to the baby and settle the baby down to sleep again, or co sleep and breast feed where you pick the baby up the minute it squeaks, shove a boob in its head and go back to sleep
I'm far too lazy to bottle feed... besides I think you either get a sleeper or you get a "theres way too much to learn to waste time on sleeping!" baby...
The thing with formula is that it isn't designed for consumption for human babies as such so its not properly absorbed...its why they have smellier poos, and have more gastrointestinal issues... but it also has the added fact that it fools the baby into thinking its fuller for longer... This in turn makes the baby wake less often for food and sleep deeper... the deep sleep is what is connected to SIDS in the same way putting babies to sleep on their fronts also makes them sleep deeper, thus the current medical advice is to put them on their backs and breast feed.
As for introducing solids and making babies sleep... it really isn't a cure
Babies like to change the ball game all the time... so while you may have them sleeping 11 hours at night one day they will just suddenly start waking up all hours of the night....
They like to keep you on your toes.