Actually quite a number of my friends are using Perla white for washing of their baby's clothes. But, if you want to try a brand that is specifically for babies, one popular brand among mothers is Cycles. http://www.cyclesbaby.com/ It is more expensive as compared to Perla, but it is hypo-allergenic as it does not contain any irritants such as dyes, optical brighteners, enzymes, bleach and fabric softeners. Pigeon is another good and effective brand that you can consider. http://ph.pigeon.com/product/baby-laundry-detergent
Perla is actually a mild detergent. But if you really want detergents specifically formulated for babies, you can try Human Heart Nature, Cycles, Messy Baby and Tiny Buds. Personally, I like Cycles and Tiny Buds the most because of the fragrant smell that lingers even after sunning. However, between the two, Tiny Buds is natural while Cycles isn't.
My mom also insists on Perla before but then her youngest sister taught me to make a baking soda solution (with water and your preferred detergent) so I can soak the clothes and it removes the stains, poop and everything.
My mom used perla for our baby clothes back then..