All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
There is no difference between the Ihraam of an adult and that of a child. The guardian should prevent his children from doing any of the prohibitions of Ihraam, like applying perfume, wearing form fitting clothes, covering the head for a male, cutting hair, cutting the nails, hunting, or scaring game off. A female should be prevented from covering her face and wearing gloves.
For more benefit on the rituals of 'Umrah, please refer to Fatwa 86764.
Allaah Knows best.