The Silver Cross Wayfarer pram system is ideal for newborn babies through to toddlers. The carrycot can be used as a lie-flat pram or for overnight sleeping and then, as your baby grows, change to the seat unit for a rearward or forward-facing pushchair.
This was the thing I had no idea I needed. Probably could have done without it, but since our swing was not really portable, I put Ella in this on the counter while I cooked, on the couch next to me while I napped, etc. etc. etc.