Can you please comment good bottles , & if a sterilizer or warmer is necessary

Hated Dr Brown; we used Tommee Tippee

No a bottle warmer or sterilizer is not necessary at all!! It’s just another thing on the market to make money. Boiling water in a pot and putting the pieces in to sterilize is just fine and just as effective. Warming a bottle in a warmer or in the microwave is also not a great idea as it can create hot spots in the bottle. You can simply heat up water in a pot and then put the bottle in there for a few minutes to warm it up if you feel the need to. Bottles I recommended are MAM. They resemble the mothers breast the best.

I used Dr Brown last pregnancy and hated them. I've used these just a couple times, my little is BFed but I love these, very easy to clean unlike DrB and I've had no leaking issues

Dr browns bottles and assortment