The health ministry named the man as Mujahid al-Khudari, 23, saying he died in Gaza City's Shifa Hospital after being targeted by an Israeli strike near the border.
The statement described the attack as "one of the deadliest attacks on children since the conflict in Yemen escalated in March 2015".
The US military said on Monday it had killed five militants after launching an air strike in Somalia against al Shabaab, a militant Islamist group allied with al Qaeda.
An Afghan forces air strike on a gathering of Taliban representatives in the northern province of Kunduz on Monday caused numerous casualties, including civilians, officials said.
An air strike hit near a school in Syria's northwestern province of Idlib Wednesday, killing at least 16 children, a monitoring organisation said.
The Saudi-led coalition is the only force known to carry out air strikes on Houthi rebel-held territory and has previously admitted to "erroneous" strikes that caused civilian casualties.
Air strikes killed nine civilians and wounded at least 6 on Wednesday in two separate attacks in north and west Yemen by the Saudi-led coalition fighting against the Houthi movement, residents told Reuters.
Eight women and two children from the same Yemeni family were killed when an air strike by forces of the Saudi-led coalition involved in the country's three-year-old war hit a wedding party ,,,
A Saudi-led coalition air strike hit Yemen's rebel-controlled state television station in Sanaa overnight, killing four guards, rebel media and the head guard said on Saturday.
Yemen's rebel government on Tuesday announced the country's main international airport was fully functional again, one week after a Saudi-led air strike destroyed the facility's navigation system.