If there's one thing I remember from my linguistics courses in college, it's that one of the biggest hurdles for adults is that they may have a fear of embarrassment that babies do not. The willingness to practice a ton while making errors is a huge advantage to children (or any adult who just goes for it).

In many English-speaking countries, most people hear foreigners trying to speak English, so we're accustomed to that. French people do hear a lot of non-native speakers of their language as well. But when I lived in Turkey for a summer during college, I made a concerted effort to built up some vocab in a few verb tenses. While I didn't get very far, it was pretty fun since it's so different from the English and Spanish I knew. It was no surprise that the Turks were amused at my pronunciation, etc. But what really stuck out to me was how a group of my Turkish friends were not only tickled, they actually were kind of confused about what they were feeling about how I was sounding until one of them put their finger on it: they thought I sounded like a small child speaking Turkish!

Why did that stand out to me? Because it dawned on me that unlike me, who had heard countless non-native speakers of my own language, they had never ever heard a non-native speaker trying to communicate in Turkish! I was amazed in trying to wrap my head around what that experience was like for them.