My daughter today morning suddenly felt weak and and she is not ready to come out of bed. She is not able to stand. Sits for a while and then again sleeps. What could be the reason. She is 21 months old. What could be the reason. She had bit lunch and breakfast though.

is she running a fever? does she wake up again in the afternoon to play? or has she been restless the whole day today? I will be worried if she is still restless the whole day. i would bring her to the doctor for a check for an ease of heart

How long has this been going on for ? Maybe she could be dreaming ? Anyways to be safe better to take her to a doctor.

Any other symtoms? Sounds pretty worrying to me. I would check with a doctor.