I have a hand-me-down travel system from Mamas and Papas and have just stopped using the car seat on it as my lo started getting uncomfortable and he enjoys looking at other things than me!  The pushchair part of it does go back at varying angles and I have it set one from the bottom, so he is still lying relatively flat but can still see.  He is 4 months today.

Helen

I moved my ds last week at 17 weeks!  I don't put the buggy completely upright, just part way IYKWIM

I moved jack this week - 22wks , 17wks corrected.  He getting too big for car seat and I've found buggy is flatter iykwim, he looked so curled up in the carseat.

kx

at about  2 months i stopped but the backof her buggy is adjustable so i slanted back a bit. it was because she hates lying flat when theres stuff tolook at!

I started puttin my ds in his pushchair at 4mths, he like to be noisy when we're out and about, and he looks huge in his carseat now riding around on the top. xx 

When did you move your babies from a pram ( i.e laid down flat) to a buggy ? Mine are 4.5 months old and seem bored with lying flat. But I don't want to move them too soon and cause them problems.