The first thing you need to know is that your children most likely want to have his/her own iPhone. After all, there are lots of people who use iPhones around your kids—whether it's the celebrity familiar on TV or the person closest to your kids. So it's not out of the question to equip your child with an iPhone. However, there are a few factors you must consider before buying an iPhone for your children, and the most important one is: they are still kids.
Generally speaking, children's self-control is relatively poor, so no matter which iPhone you buy, you'd better use its built-in Screen Time function. This feature can limit the time your children spend on the iPhone, and can prevent them from downloading some apps that are not suitable for young kids. In addition, when your children are going to sleep, you can also use this function to prevent them from playing with phones under the quilt. In short, this feature can help you limit your kids' screen usage time in places you can't see.
In addition, if your child is still in the stage of babbling or toddler, I don’t think it is necessary to buy him/her an iPhone. Because children of this age basically aren’t able to use smartphones, all they need is to play some puzzle games, use some educational apps, or watch some videos such as cartoons—an iPad which is equipped with a larger screen can better meet this demand. What’s more, the iPad will not use your data traffic, which can prevent children from spending too much traffic when playing. Besides, the price of the iPad is relatively cheap. Of course, once your child is old enough, you can buy him/her an iPhone so he can use it to text, make calls, surf the web, and so on.