Just that really.
It is to correct an umbilical hernia that she's had since she was a few weeks old. She's now almost 4 and we've waited this long in the hope it would correct itself, which it hasn't. It shows through her ballet dress, swimming costume etc. and I have seen kids pointing it out in the changing room, so I'm sure she'll want it done when she's older if we don't do it now, but we've decided to get it out of the way before she starts school.
But I feel so worried that something will go wrong and I'm not sure it's worth the risk for something that is largely cosmetic but could cause her problems in the future.