I've searched for kid-friendly hotels and according to Tripadvisor reviews, Discovery Primea, Fairmont Makati, The Peninsula Manila, Makati Diamond Residences and Holiday Inn & Suites Makati are a few of the recommended hotels.
Meanwhile in this blog, one of the mentioned kid-friendly hotels in Manila would be Makati Shangri-La Hotel and another point goes as well for Discovery Primea.
You can check the blog here: http://globetotting.com/the-best-family-hotels-in-manila-the-philippines/