Drawing a newborn baby
If you're drawing for a hobby, some tips for beginners can be found here and here.
Firstly, you can improve your drawing by:

Drawing newborn baby anatomy - I found a cute example for you here.
Reading this.

Control your drawing. You can practice some baby gesture drawing, and add light and shadow.
Here is an expert tutorial: press hard for dark skin tones and lightly for pale skin tones while coloring; only mix colors by coloring the drawing layer by layer; different shadows, tones, and highlights will yield a better result.
You can find many references by searching for 'baby portrait', 'cupid painting', and similar terms:

A newborn baby is similar to a sleeping baby in appearance.
Cupid painting has a long history and references can be found easily for many styles and periods.

You have a long way to go to become a realistic artist, but if you seriously want to be an artist, you can find short courses or even follow higher education in fine arts to enhance your skills.
Good luck!