Is it because the newborn is hungry that they suck their hands?

Patient's question:

My baby is a premature child, and I was very worried about the child's condition from the beginning. Recently, the child has appeared with this series of situations, and I am also very worried, afraid that the child will become more serious. Please ask if newborns sucking their hands are hungry

Doctor's answer:

Hello, sucking the thumb should be an unconscious action for newborns, of course, they may also suck at foreign objects when hungry. You can feed the baby promptly and take good care of them as usual.
Hello, the symptoms of a urinary tract infection are caused by inflammation and irritation. It is necessary to treat them with oral antibiotics in a timely manner. It is recommended to avoid spicy foods, drink more water, get adequate rest, and recover quickly.