Hi, just my 2 cents worth we went out when DS was 6 and a half weeks old - and he stayed away the entire night!!! Which I know will make people think I am a bad mum. But having said that he was with his Aunty who is pregnant (and 19) and her mum thought it would be good practice looking after a young bub...her mum was there too! I could have picked him up but decided that would be more for my benefit than his. He was sleeping from 7-5 at that stage with just a dream feed at 10pm so picking him up at 12 would have just woken him up unnecessarily. Apparently he was an angel and didnt even cry (only when he wanted feed) and I was back there at 630am to pick him up. I say do whatever is right for you.