First of all, congratulations to your sister-in-law. Giving birth to a child is a very happy thing. A child is also the best gift God has given to your sister-in-law.
Secondly, there are gifts. You can choose to give your sister-in-law a gift, or you can choose to give your child a gift. If your sister-in-law gives birth to a little girl, you can choose some clothes for the child, beautiful clothes, or warm items such as small blankets and silk quilts. Such gifts are not only practical, but also very popular with children! Moreover, children need to be wrapped in small blankets or something when they are just born, because they cannot stand the cold. What a thoughtful gift.
Of course, you can also choose to buy some small toys for the child. Generally, boys and girls are willing to play with them. If they are not willing to play when they are just born, they can play with them after a long time. You can choose to give some educational toys, so as not to let the child lose at the starting line, haha.
Finally, there are more practical things such as diapers. These children will use them every day. Over time, it is also a considerable expense. If you give some, your sister-in-law will save some.