After a normal birth, the mother needs to sit for the first month. During this month, you need to pay attention to rest, enhance nutrition in appropriate amount, and pay attention to keep warm. It takes about 42 days for the uterus to return to the state it was in before the pregnancy, so it is not allowed to touch cold water within these 42 days. Contraction or joint pain problems. If in the hot summer, also can not use the water just taken out of the freezer or food taken out of the refrigerator, it is best not to touch for a longer period of time, if the contact time is easy to lead to the occurrence of rheumatoid arthritis.