Newborns are smaller and lighter than older babies, and they lack the neck muscle strength to support their own heads. Because of this, slings and wraps are ideal, but you should still carefully check that your baby is sitting correctly and is well supported.
Look for soft, stretchy materials that provide a snug hold, and ensure that nothing interferes with your baby’s breathing. Check that your baby carrier is suitable for the age and weight of your baby, and learn to wear it in such a way as to provide as much neck support as possible. Avoid any style that requires the baby to sit upright or support their own head, such as backpack carriers, until they are older and stronger.