If it was on an adult, I would wait......but for a child?? I'd go NOW! And even though peroxide is a great antibiotic, I was told that since cat bites are deep puncture wounds, the bubbliness of peroxide could force the infection INTO the wound.

I've had cat bites (MANY) and at least one got infected even though I did all the right things. A cat bite put a cowerker in the HOSPITAL for 4 days!!

Don't take chances.