Re: 4.5 month old and solids
I'd hold off a bit longer. When your LO sees you eating and acts interested, he's not telling you he's hungry- just that he wants to play with your "toys." If you give him a cup, spoon, and bowl during your mealtimes, he'll probably be quite happy exploring those. That being said, there's probably no great harm in letting him play with solids and tastes, provided he isn't eating anything. You could try offering him a whole peeled apple to lick, or a clean bone. Those are interesting to taste, but the baby can't really eat them.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"