Hi mama! Nature One Dairy is actually quite well-regarded, it's Australian-made, Halal-certified, and the organic Step 1 option is designed for newborns from 0, 6 months, so it should be suitable for your little one. A few mums I know felt it was good value for money and their babies took to the taste well, though one thing worth noting is that some versions contain sucrose, so if you prefer to avoid sweeter formulas you may want to check the ingredient list carefully before committing. On switching from NAN 1, the general approach most mums follow is a gradual transition, mixing the new formula in slowly over about a week or two (for example, 75% NAN, 25% Nature One Dairy, then adjust the ratio bit by bit) so your baby's tummy has time to adjust. That said, since your baby is a newborn, it really is worth checking with your PD first before making any switch, just to be sure!