why this bump in my 3 month baby hand

A. Dry bumps on the palm of your 3-month-old baby could be caused by a few different things. One common possibility is eczema (atopic dermatitis), which can cause dry, itchy patches of skin, including on the palms. It could also be a mild form of keratosis pilaris, which presents as small, dry bumps on the skin. Another possibility is a reaction to a product like soap or lotion that might be irritating the skin. To help, make sure your baby’s skin is moisturized with a fragrance-free, gentle lotion or cream. If the bumps persist or worsen, it's best to consult your pediatrician to rule out any conditions that may require treatment.