Babies are unstable.
Babies really can't do a lot of work. However, they do bring a lot of excitement into a church family. As they grow, it is also exciting to watch them learn to do things for our Lord. If they continue to study and practice the basics of the Christian life, they will eventually get mature and settled in the work of the Lord and in walking with the Lord. That is, he has a routine of serving the Lord, and he sticks to it.