DD is only 9 months, she's our only child.
I do often leave DD with my mum (when I'm at work for a couple of hours) and I'm fine with it.
DH can't come to the wedding anyway, as he is working away. It's in a different country (the wedding) but not exactly far, but need to go on a plane. It's my best friend, so I'd rather not miss it, she is like my sister. No children are allowed... it clearly says on the invite. There's a massive apology that babies and small children cannot attend. I'm assume a few teens will be there (she has a lot of family that are about 12+). Of course it's her wedding and she can invite who she likes, but I don't think I'm happy to leave DD with my mum for 4 days and nights... 1) not sure it's fair on my mum 2) I don't particularly want to leave her for that long on her own, as she definitely can't settle properly (at night) without me 
I literally feel so sick.