Gilbert Physiodose Sterile Physiological Serum 40 Single Doses is a physiological serum for babies. It comes in a box of 40 single doses. To clean a baby's nose, soak a piece of cotton with physiological serum and gently insert it into the baby's nostril. If the baby's nose is congested due to a cold, tilt the baby's head and gently squeeze the single-dose unit directly into the nostril. Wipe with a clean tissue. To clean an infant's eyelids, moisten a soft cotton pad with physiological serum. Each box contains 40 single-dose units.