Sunscreen, anti-insect spray and umbrella are our must-haves during a vacation. Our weather right now is very unpredictable, so it's best to be armed with these just to be safe. According to Accuweather, Cebu will be experiencing a mix of cloudy and sunny days, with a few occurrences of t-storms. So I guess those 3 I've mentioned should go handy. :)
We would always take our SSC and umbrella stroller with us. Sunscreen and insect repellents too. You may also want to consider bring your kid's meds just in case.