و عليكم السلام ورحمة الله وبركاته There is nothing wrong with that whether it is for the Friday prayer or for the daily congregational prayers . The Prophet صلى الله عليه وسلم did it as in the authentic hadith " Narrated Buraydah ibn al-Hasib : The Messenger of Allah (ﷺ) delivered a speech to us; meanwhile al-Hasan and al-Husayn came upon there stumbling, wearing red shirts. He came down from the pulpit, took them and ascended it with them. He then said: Allah truly said: "Your property and your children are only trial" . I saw both of them, and I could not wait. Afterwards he resumed the speech. " Also his companions رضي الله عنهم did it with their children. But the child’s guardian should take care of him in the Masjid so that his child does not cause the worshipers to lose Khushoo . Likewise, it should be known that if the child has not yet reached the age of discerning the rulings of prayer and purity , then he should not sit in the rows with men , but rather stand in a separate row or in some other place so that his presence does not break the Saff because he still doesn't have any prayer upon him yet . And Allah عز وجل knows best .