Is it normal for babies to laugh at 40 days?

Baby 40 days will laugh is also a normal phenomenon. This can be based on the baby's development status, some babies brain nerve development is relatively early, will also show a smile of an expression. It is recommended that you can often communicate with the baby, you can also buy some bright toys, put on the baby's bedside, let the baby often see, this is also conducive to the baby's growth and development, but also can often amuse the baby happy. Attention should be paid to ensuring the baby's sleep situation at ordinary times, so that the baby has a good sleep quality and allows the baby to sleep in a relatively quiet environment.