When to change from pushchair to stroller?

[lovingpickles]

Pushchair is very bulky so not keen to take on holiday. When can little ones go in strollers?

When they can sit up with support - some time between 4 and 6 months depending on the baby.

Can you get one which reclines flat if he/she is still sleeping a lot in the day? Something like an OBaby Atlas, M&P Pulse/Pipi, Maclaren Techno.