How many of each

After organizing my babies clothes and putting it into its own little spot, I now know what I have and what I need. I only have 1 pair of newborn sweatpants (leggings) , 1 newborn sweatshirt. My Baby is a January baby so these are needed. And absolutely no 3-6 month pants or shorts. How many is necessary to have so I know what to get? She mainly has a lot of long sleeve onesies, gowns, swaddles because it's so cold where I live.