Baby seagull

We have this baby seagull in our garden. We have left it alone but have an 8 year old who wants to go in her paddling pool and a cat who now refuses to go out because she got dive bombed yesterday by the parent gulls. 

It looks really quite young and I can’t see any wing development so I am wondering what I can do? 

How long (ish) until it grows enough to fly? Can I move it somewhere else? It’s been in the garden about 24 hours now!