If you're from Manila then Batangas would be a great choice. Kids get antsy on long drives so it's best to choose nearby vacation spots. If you prefer the beach, you can check out Laiya. However, if a cooler climate is more you're speed then Tagaytay will be the perfect choice. :)
Since you mentioned your boy is still a baby, you might want to consider Manila's adjacent provinces that doesn't require a really long drive. You may check this list for options :) http://www.thepoortraveler.net/2013/03/15-great-destinations-near-manila-philippines/
Promo terbesar expert care sudah dimulai, diskon hingga Rp.100.000 sedang berlangsung di shopee, ada juga voucher diskon 100% alias gratis bagi bunda yang beruntung. Buruan cek di https://shope.ee/9UfEMMqqTg (id-12110)
You may consider nearby areas like Tagaytay and Batangas. There are a lot of resorts in Batangas and Tagaytay is known as a vacation spot. There's also Laguna, Bataan and Subic, whichever you find convenient for you.