The baby always stretches hard, suggesting that it may be growing and is relaxing throughout the body, stretching the muscles and bones and promoting growth. Usually, this situation will slowly disappear after three months. The baby grows faster, but the nervous system is not yet well developed, the chest will be squeezed when stretching, which can stimulate the heart and lungs to a certain extent, which is conducive to the full exercise of the heart and can also provide more oxygen. And stretching also helps to relieve fatigue and promote blood circulation, which is very good for growth. Usually this will gradually disappear after the baby reaches the age of three months. Parents need to pay attention to the baby always stretches hard, if the mental state is good, eating milk is also normal, you can not worry too much. But if your baby is not in good spirits and always crying, you need to pay attention to see if your baby is physically unwell and find out the cause for comprehensive care.