I don't have any advice sorry. My excuse was BF & night waking. My DS was 14mo before I let him stay overnight at my mums. He was fully bottle fed by then. DD is still BF & has never stayed overnight anywhere (she's almost 10mo). DH wants me to wean her so that we can go away for our anniversary but I keep telling him it is up to her. I'm not going to wean her just so he can get some lol!