20 days old is difficult to schedule sleep
As baby required feeding every 2-3 hourly once ,the rest they are mostly sleeping
As the baby grows around 3-4 months , they start demand feeding where you get 4 -5 hours gap
Next Steps
After 6 months when you start giving food for baby ,advice to start giving food at our regular break,lunch,dinner timings and give one morning nap or around 12-2 pm and get the baby to sleep early by 8 pm in the night .. hope this helps
Health Tips
The best option is get sleep when baby sleeps for now