Honestly, both are solid choices, a few of us tried Cradle and it's really gentle, walang harsh chemicals, pero Human Nature din ay pregnancy-safe at breastfeeding-safe ganitong mindset kaya trusted ng maraming moms here! Since your pedia derma already recommended Human Nature and you're comfortable with it, I'd say stick with that na lang instead of switching again, kasi may cycles na rin siya sa laundry which is super convenient. But if you're curious pa rin, basta make sure whatever you pick ay specifically for bottles and hindi lang regular dish soap, para safe talaga sa baby's bottles.