There are several but one of the better know was St. Germaine Cousin. She was born sickly and badly deformed. Her mother died when she was quite young and her father's new wife hated her and treated her quite badly.
She was born in 1579 in Pibrac, France, and died there in 1601. She was canonized by Pope Blessed Pius IX on June 29, 1867.
As per the Patron Saint Index, William of York is a saint but not currently a patron saint.
There is no patron saint of bullying or against bullying.
Yes he is the patron saint of repented thieves.
There is no patron saint of children's health but the Infant of Prague is the patron saint of good health.
The patron saints of unborn children are Saint Joseph and Saint Gerard Majella.
Saint Nicholas of Myra is the patron saint of children, scholars and penitent thieves as well as a number of other causes. For a complete list of his patronages, click on this link.
As per the Patron Saints Index, the patron saints of unborn children are Saint Gerard Majella and Saint Joseph.
I see no specific saint for healing of children. However, St. Brigid of Ireland is considered as the patron saint of healers.
The patron saint against autism is St. Ubaldus Baldassini.
There are patron saints of children or orphans or social workers but no patron saint of child custody.
The patron saint of running water is St. John Nepomucene
Saint Scholastica is the patron saint of:against lightningagainst rainagainst stormsBenedictinesconvulsive childrennunsLe Mans, FranceMonte Cassino Abbey