Hi, thanks for writing to Practo consult.
We can try to increase weight of baby by giving proper nutrition, which I have mentioned later. About colour, every baby is born with unique color, appreciate it, why do we all have to be fair? You can anyways try yo keep the skin moist and soft by using baby moisturizer cream. Dryness of skin can worsen the look.
Hope this helps you
Next Steps
Do go through this article of mine."Are You Giving Your Child the Nutrition He Needs?" by Dr. Poonam.M. Sambhaji - https://www.practo.com/healthfeed/are-you-giving-your-child-the-nutrition-he-needs-20610/post