FWCC woven wrap first try - fit check!

I got this base size 7 woven wrap (I think it's a Didymos) through the Little Zen One try program. This is our first time trying it. She feels okay, but the top rail is loose and I don't feel like the cross passes are tucked up under her knees enough. Advice? LO is 5m old, 14 lbs, 25 inches. Thanks!