Insect bites on babies' sensitive skin, what do you put?

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Hi again to all moms out there! Please help me. My baby is just 9 mos old, and she has plenty of mosquito bites! We've cleaned our place,and we are planning to sray insect killer when we go out. Still, I'm really worried and concerned about my baby skin. And of course Dengue! Really scary!I hope I can do something more! I put Off lotion on my baby's skin. Please help me, if you have any suggestions on what's the effective way or natural way to kill/repell mosquitoes.