Wa'alaikum assalam sis! Okay, this is actually a sensitive religious and medical question, so I really think you should speak to your local imam or Islamic scholar first, they'll give you the best guidance on timing and whether it's still appropriate at 7 years old. Then check in with your paediatrician or a doctor who's experienced with this, sebab ada medical considerations jugak at different ages. A few of us mums have asked our imams about similar situations, and dorang always recommend getting both religious and medical advice together. Don't stress lah, you're thinking about it now, that's what matters!