Talk to Pediatrician on Milk To Feed

My son is almost 22months old. He had been breastfed till 20 months. After that, for a month we fed him Nido 1+, but then thought it might not good be for him since it is not an alternative to or equivalent to natural milk. Now, we have been feeding him Olper's milk after bowling it. I wanted to ask if this is the right choice? I am not sure what is his weight, but he doesn't seem weak or underweight at all.