The baby suddenly became very sleepy, what's wrong?

Patient's question:

No

Doctor's answer:

Okay, here is the translation following your instructions:
Normal. Generally, smaller babies love to sleep. Babies need to sleep well in order to grow well; as long as he is alert when awake and not drowsy, it's normal.
Normal. Generally, smaller babies love to sleep. Babies need to sleep well in order to grow well; as long as he is alert when awake and not drowsy, it's normal.