...I don't know what he likes. But get something for Nerdanel too, she helped. Where would I go to get weird kinds of ink?
Hourglasses, windows, suncatchers - well, treelight catchers - plates and cups. Wind instruments. Paperweights. Marbles.
Well, they're not actually his, but I'm loath to take them away right now.
No. She is a much more typical Noldorin child, except that she spends lots more time at Aulë's knee than most of them get to, and she might contentedly follow his lead in building things or teach him things he doesn't know or she might take serious offense if he requisitioned something of hers because he liked it and throw him in a fountain and explain to Finwë that she was justified.
He should have peers, but adults are much more predictable and less likely to provoke some kind of disaster when in contact with him. And most parents of children his age at least impress on their children that they should impress the crown prince, he's very important, but Mahtan would probably just tell his daughter 'I've heard he learns quickly, check if that's true'.