hi there, your baby is getting these rash
as you have said due to prolonged period of wetness and also as north India is drier in the winter months the skin is more prone to cracking and infection. Avoid delay in cleaning the child and do try to use moisturisers all ove t the infants body including her buttocks and private parts. Using a moisurized cleaning swab as those commercially available would also help. Do not wipe vigerously with wet cotton or cloth as they denude the tender skin of the baby making it prone to infection.Take care.