Leaving 18mo old for 4 day

Hi all,

So my husband and I got a really cool opportunity to go to the winter xgames in Aspen this month. It’s 3 nights and 4 days and we are not planning to take our LO. I’m starting to freak out about leaving him- is that too long to leave him? I’ve only left him over night once and it was very quick. He would be with his Grandma’s that he loves. I’ve read stories that at this age they can get depressed if you leave them more than 2 days. Thanks!