1. Diapers (i used almost 4 big packets in the 1st month)
2. Wet wipes (not necessary because you can use a cloth and warm water to clean)
3. Swaddle (they need to be swaddle at least for the first 3 months)
4. Newborn clothes (they don't need that many because they will grow out of it very fast)
5. Mitten/booties (only the first 2 months)
6. Bath essential (shampoo, soap)
7. Nappy cream
8. Body lotion
9. Burping cloth
10. Pacifier (personal preference)
I recommend you to prepare all these at least when you enter third trimester of your pregnancy.