agreed - we were scared to leave our son with someone who we didn't trust / didn't know. the first time we used rent-a-mum we were just away for the min 3 hours, but as we got more comfortable (we used the same person), then it became easier. rent-a-mum services all the big hotels - Pacific Place Serviced Apts, Mandarin, Four Seasons in HK so that have a reputation and are legal. It's pricey, but worth it for the safety of your child.