It may be normal for a 2-month-old baby to not be able to lift his head. It may be normal for a 2-month-old baby to be unable to raise his head when lying on his back. At this time, the baby’s bones are softer and have no strength, so he will not be able to raise his head, and he will usually be able to raise his head at the age of three months. Some babies may have better development and stronger physique and will raise their heads at two months, but this is also an individual phenomenon and parents need not worry. At three months, babies can hold their heads up while lying on their stomachs, laugh out loud, eat their hands and play on their chests, which are all normal developmental signs. However, if the baby is still unable to hold his head up after three months, it is necessary to consult a doctor to check on the child’s development. If the practice is too little then you can practice more lying down to increase the head and neck strength. If your baby has developmental problems, you need to see a doctor.