How do I get my 18 month old to stop throwing things?

Make sure that no one laughs or gives other positive response when they do it. Don't just take that toy away, take all toys away for at least two minutes. When they have a toy and don't throw it, praise them. Give them hugs and attention.

When they do throw something, do not react. Dont' get up to get it or anything else. Do that when they are not around. If they throw all their toys, they have nothing.

It's all about them getting a reaction, negative or positive. So you need to stop reacting. (That goes for everyone in the house). And that's always. If they get some reaction some times, they will keep it up.

Aside from firmly removing things they throw, try catching and distracting them first. If you are watching, you can usually tell if they are about to throw an object, stop them before it leaves the hand, and then praise them for being good and NOT throwing it. Depending on why they are throwing things, there are other techniques. If it is anger, take the toy away, and move them to a time out for a moment. If it is for attention, stopping them first, and praising for being good, and then giving them some one on one playtime works best. If it's just because they like throwing things, get them something they can throw and teach them where to throw it. They can toss a soft ball into a basket, or only in the hallway for example. In that case, when you catch them about to throw, move them to the appropriate place and give the safe throwing toy.

Be firm when telling them no. if they dont listen remove the item that they have thrown. they will fully understand. kids are underestimated. if you said heres some sweeties they would come running so they can certainly understand the words no and stop. if by taking the toys away they continue try time out. You should also try take them for walks etc every day maybe toddler groups or park. their behaviour isnt going to change if they dont have anything stimulating to keep them going.

my son use to be bad at that. what i did was got one of those mini basket ball nets with a soft ball and tried to encourage him to throw just that. and instead of just telling them you are going to take it away. actually take it away. sometimes when my kids were that age i would give them a time out (put them in there crib) for just a min. for the most part they forgot what they were doing and go and find something else to do