I see no specific saint for healing of children. However, St. Brigid of Ireland is considered as the patron saint of healers.
Patron saint of the pancreas
The patron saint against venereal disease is St. Fiacre.
There are no patron saints for the general term of healing. However, there are patrons for specific maladies.
There are no patron saints of healing after hip surgery.
Yes, Saint William of Rochester is recognized as a patron saint of adopted children, foster children, and parents who have lost children.
The patron saint against stiff or sore joints is St. Werenfridus.
St. Luke is the Saint after going in to surgery and the saint for Surgeons.
Saint Dymphna is often considered the patron saint of those suffering from emotional and nervous disorders. She is known for interceding for those facing mental health challenges and is believed to offer comfort and healing to those in need.
There is no patron saint of bullying or against bullying.
No, Saint Nicholas is not the patron saint of thieves. He is the patron saint of children, sailors, and the falsely accused.
Saint Gerard Majella is often considered the patron saint of sick children. He is known for his miracles in healing the sick and is popularly invoked by those seeking help for ill or hurting children.
There is no patron saint of children's health but the Infant of Prague is the patron saint of good health.