This is a list of myths about teaching multiple languages to your kids. It’s based in part on the list found here.
Why don’t you teach them 1 language first, and other languages later, when they speak the first language well?
It is easier for a child to learn multiple languages at the same time, than to learn 1 language well and then learn another one. Just look at your own experience learning new languages. There are plenty of studies showing this.
Won’t they learn slower or be more confused if you speak multiple languages to them?
No, not really. Many countries are monolingual, and parents there are not used to multilingual kids. But many countries are also multilingual, and experience shows that kids can easily learn multiple languages (up to 3 or 4 without problems). It all depends on the amount of exposure they get to those languages and the motivation they have to speak them.
The kid mixes languages, they won’t learn to speak properly.
Children mix languages when they are learning multiple languages, this is completely normal and temporary. The more words they learn in each language, the better they’ll get at distinguishing them.
Other myths, or things that concerned parents of monolingual kids (or your parents) tell you?