what is the size for Newborn diapers?

I haven't had the baby yet, I'm still not even in my second trimester but eventually I need to start stocking. 
There's so many numbers and I have no idea which one is for a newly newborn and how many boxes do you think I'll need until they need a bigger size? 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors