My sister, who is nine years my senior, used to take me out in my pram. Apparently, so she tells me, I used to be strapped in by reins and she used to run with the pram and then stop and tip it towards her suddenly so that I would shoot down to the bottom of the pram, suspended on the reins. Apparently I laughed like a drain which was why she persisted in doing it. Mother, I think, might have been less inclined to let her take me out had she known.
I do need to point out that this was the summer so, being born in January, I was far from a newborn. I don't appear to have come to any harm.