What’s Causing My Child’s Diarrhea?

My child is 6 months old and recently started solid food and switched to a 2-stage MilkPowder. Their stool has become loose, but the color is still normal. Additionally, they don’t sleep much during the day, are always crying and fussing, and it takes a long time to soothe them to sleep. They sleep for a short period but are still lively. They can sleep through until 6 AM in the morning. Their hair also seems a bit yellow, and I’m wondering if there’s something wrong with their body?
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