Baby Sophia is almost 5 months old, and she is on size 3 diaper (16 to 28 lbs). I recall she was born at 7 lbs and 3 oz, quickly reach 10 lbs which also outgrew new born size diaper. Similar thing happened to size 1 diaper, she reached 14 lbs at 2 month mark, and now we have both new born and size 1 surplus diapers
Things slowed a bit since 2 month, she was about 15.5 lbs at 4 month checkup. Nonetheless we used all size 2 diapers (12 to 18 lbs), and started size 3 (16 to 28 lbs).
As to diaper brands and type, we used huggies natural new born, pampers swaddler new born, huggies snug and dry size 1, a store brand size 1, huggies little smuggler size 2, and pampers swaddler size 3.
Thinking switch to huggies snug and dry size 3 in the future, that’s what our elder daughter had most of time, and it sells for $39 per 210 at Costco. A bit cheaper than pampers swaddler.