Every child has an off week, a subject they dislike, or a phase of not wanting to go to school. Most of the time, that's just development being uneven — not a sign something's wrong.
Signs that usually settle on their own
Short-lived resistance to a new routine, one-off dips in a single subject, or a temporary phase tied to a life change (a new sibling, a house move) tend to resolve within a few weeks.
Signs worth a closer look
A struggle that's lasted months, shows up consistently across settings (home and school), or is getting in the way of friendships or daily routines is worth a conversation with a professional.
When in doubt, an early, low-pressure conversation costs little and often brings real peace of mind — either a reassuring "this is normal," or a clear next step.