Is It Permissible to Attend a Child's Birthday Celebration in Islam?

The basic ruling is that celebrating a birthday as a religious ritual or considering it obligatory is not correct. However, if the gathering is simply for family togetherness, a child’s happiness, and is free from all prohibited elements (like music, immodesty, free mixing, etc.), then attending is permissible.

It is better to treat the occasion as an opportunity to thank Allah for blessings and health, hold a simple gathering, prepare or bring something for the child’s happiness, or give a gift.

Still, if you attend, you should gently advise the family not to engage in prohibited things.