A stellium is a group of three or more planets in one sign. If your child was born with a stellium in their natal chart, you can be sure they’re going to specialize in something. The larger the stellium, the more focused they’ll be. It’s sounds simple, but it’s not.
Your child will exemplify the qualities of the zodiac sign their stellium falls in. For example, a child with a large stellium in Leo is going to be seen everywhere he or she goes. A child with a stellium in Sagittarius is likely to be buoyant and outgoing. They’d also be inclined to wander off or leave through the window as a teen; off on an adventure.
Outside of the sign the stellium falls in, you want to consider the planets involved. If Jupiter is part of the stellium, the energy will be expanded. If Saturn is involved, your child may be slower to develop their expertise or even be afraid of it. If there are outer planets in the stellium, they will enhance the energy in different ways, depending on the planet involved.
You should also consider the house(s) the stellium falls in. There areas of life indicated will most definitely be important to your child. The house(s) will be your child’s, AO or “area of operation”.
Parent generally try to guide their children in some way. If your child has a stellium, their interest may seem narrow to you, especially if you don’t have a stellium yourself.
I think it’s a mistake to try to dissuade a child who is focused on something, to develop other interests. While it may be important to develop the qualities of the sign opposing your stellium, this is something that can be taken up later. A child with a stellium most likely has a certain vocation. You want them to discover what it is.
Does your child have a stellium in their chart? What sign is it in? What house? What are your observations?