My 20 week will be during school holidays and I am thinking of taking my DS4 and DD7 (all my usual babysitters will be away!!). My only fear is how we will deal with it if something abnormal is picked up on the US. I think back to the 20 week US with DS (we were told he was 'non-viable') and I don't know what I would have done if DD had been with us. On the other hand, I think it would be really special for them to see their baby brother or sister while still in mummy's tummy! Your DD is younger than my two... I'm not sure if that makes it easier or more complicated!

I'll be interested to hear what other people think.