When your baby stop put everything into their mouth?

It varies for every child. Children learn about objects (texture, taste etc) by putting everything into their mouths. Especially once they discover how their hands could help accomplish this action, more things will be going into their mouths. One of my friends with two children, her elder son only stopped (kind of) putting things into his mouth when he was 3. Her younger daughter, now 18 months, is still doing that (though not as often as when she was below 12 months). Think her daughter doesn't like how some stuff taste, so will spit things out instead of blinding putting everything into her mouth like when she was younger. Sounds terrible, but my friend is always very amused when she caught her daughter doing that.