Because my 4 and 6 year old dds broached the subject on the way back from the zoo today, having seen lots of baby animals. I'd sort of glossed over it with 6 year old in the past, but a bit vague about the actual ins and outs.
[no pun intended}
I was driving at the time and find it hard to formulate thoughts while concentrating, so fluffed it a bit, and for some reason concentrated mainly on cattle. I'm not sure I did a good job as 4 year old's conclusion was 'Oh my goodness, you did that to daddy? Didn't he mind!?'
So, anyone got any better ways of explaining it well?