I'm glad to see your growing up.
I'm glad that you've been grown up.
或
I'm glad that you growed.
I'm glad that you've grown up.
I am glad that you have grow up. or
I am glad to see you as a big boy/girl.
I am so glad to see that you have already grown up.
参考资料：||
I'm happy to see you grew up.
I'm glad to see you grow.
i'm happy that you grew up“面朝黄土背朝天”写的满对的！
I am happy that you grew up.
it is happy to see you grow up