Do I need a waterproof sheet for the carrycot?

[hannahbanananana]

I have the iCandy Peach 3 Carrycot. I have regular moses basket sheets which fit it, but do I need a waterproof sheet underneath these? It won't be used as a moses basket or anything, just with the pram x

Optional really and a lot will depend on the baby. Mine very rarely possets so I don't bother. If you have a baby that often burps up millk it might be useful.

Or of course just fold up a big muslin and pop it under them (my preferred method of protecting the pram against endless nappy blowouts...) ;)