(I would like to introduce my son to people in positive way.)

My 1-year-old son is a caring and intelligent. And also he is a calm and reserved person. It’s sometimes hard for him to fit into new surroundings. However, once he gets to know it, he is a completely different person. He becomes active. He loves airplanes, trains, cars and cooking. He has own frying pan and practice tossing the frying pan every day. この表現は自然ですか？

In all, this paragraph is pretty good. However, there are little tweaks that you need to change. For example, the grammar is a bit messed up in certain parts. The paragraph would sound better if you said this, "My one-year-old son is a caring and intelligent child. He is a very calm and reserved child, but it's sometimes hard for him to fit into new surroundings. However, once he adapts, he transforms into an entirely new person. He becomes active (add more positive aspects to make this bigger). He loves airplanes, trains, cars, and cooking. He even has his own frying pan and practices tossing the frying pan every day."