Yes, children of any age — including infants — can perform Haji, and their ibadah haji is valid according to all four schools of Islamic jurisprudence. This is based on the authentic hadith in which a woman lifted up her child to Nabi Muhammad (shallallahu alaihi wa sallam) and asked, 'Is there Haji for this one?' He replied, 'Yes, and you will have a reward.' However, it is important to understand that a child's Haji, while valid and rewarding, does not fulfill the wajib Haji that becomes binding upon reaching puberty. Once the child reaches the age of puberty and meets the other conditions of obligation (financial and physical ability), they must perform Haji again as their fardhu (wajib) ibadah haji.
For children who have reached the age of discernment (mumayyiz, generally around seven years old) and can understand the rituals, they enter ihram themselves with their guardian's permission and perform the rites as an adult would — Tawaf, sa'i, standing at Arafah, and so on — with guidance and assistance from their parent or guardian. If they are unable to complete certain rites (such as stoning the Jamarat due to the dangerous crowds), their guardian may perform those acts on their behalf. For children below the age of discernment (infants and toddlers), the parent or guardian makes the intention for ihram on the child's behalf, carries them during Tawaf and sa'i, and ensures they are present at Arafah and the other stations. The child's ihram garments follow the same rules as adults for boys; girls wear their normal modest clothing.
Practically speaking, taking children on Haji requires careful planning. The physical demands of Haji — long walks in extreme panas, massive crowds, sleep deprivation during the Muzdalifah night, and the multi-day stay in Mina tents — are challenging even for healthy adults. Parents should honestly assess whether bringing young children is feasible given the specific conditions. Consider the child's age, temperament, health, and your ability to care for them while completing your own rites. Many scholars advise that while taking children is rewarding, it should not come at the expense of the parents' ability to focus on their own worship and complete their rites properly. A stroller suitable for rough terrain is essential for toddlers, and extra supplies (diapers, formula, snacks, medications) should be packed generously.