Oo, normal lang yan! Mine smells a bit different too kapag galing sa freezer, parang mas malalim or slightly sour ang lasa ng amoy, kaya nag-aalala din ako dati haha. A few of us moms in my group noticed the same thing, and our pedia said it's just the lipase enzyme doing its thing sa stored milk, which is totally okay for baby. As long as walang obvious spoilage signs (like super sour smell or discolored), it's still safe to give, pero if ang amoy talaga ay off or nakakaworry ka pa rin, better check with your doc just to be sure!