The child is a XX constellation, but after learning other constellations, it becomes completely different. What shall we do? Can we change it later?

What a child becomes has nothing to do with the constellation. Don't rely too much on or trust the horoscope. You should set an example for your children. Parents are your children's best teachers, and then your children may be a little rebellious. This is normal. Tell your child slowly in life, communicate with your child in time, and solve the problem slowly.