To describe a child dancing in Engpsh, you could say "The child is dancing" or "The child is performing a dance." You could also use more specific language to describe the type of dance, such as "The child is tap dancing" or "The child is doing a ballet dance." Here are some examples of how you could write this in Engpsh:

"I watched the pttle girl twirl and spin as she danced around the room."
"The boy was full of energy as he bounced and moved to the music."
"The group of children were all smiles as they performed their dance routine on stage."

It's also possible to use adjectives to describe the child's dancing, such as "graceful," "energetic," or "creative." For example:

"The child's graceful movements and fluid turns caught everyone's attention."
"Despite her young age, the child's energetic and expressive dancing captivated the audience."
"I was amazed by the child's creative and unique interpretation of the dance."