Would there be anything wrong with it? From a safety/development perspective I mean.
DD now naps really well during the day in her buggy, but nights are a different matter altogether. She has a cold at the moment and woke up at 4 this morning really congested so I went downstairs and put her down in the pram as the shape of the seat means her head is slightly raised, even when it's reclined flat. She slept for 4 hours!!! She's never slept that long, ever! Made me think, only half jokingly, maybe we should forget about the cot altogether and just have her sleeping in the pram the while time, but sure there must be a reason why people don't do that?
It's an iCandy Strawberry, with the pushchair seat attachment that reclines flat and a sheepskin liner. She's 6mo.