The pictures show the infant in an incubator at Al-Sabeen hospital in the Yemeni capital Sana’a, the Daily Mail reported.
The Saudi war has killed tens of thousands of people, most of them civilians, and driven millions more to the brink of famine.
The war has been described by the United Nations as the world's worst humanitarian crisis.
Saudi Arabia and a number of its regional allies launched a devastating campaign against Yemen in March 2015, with the goal of bringing the government of former president Abd Rabbuh Mansur Hadi back to power and crushing the Houthi Ansarullah movement.
The US-based Armed Conflict Location and Event Data Project (ACLED), a nonprofit conflict-research organization, estimates that the war has claimed more than 100,000 lives over the past four and a half years.
The war has also taken a heavy toll on the country’s infrastructure, destroying hospitals, schools, and factories. The UN says over 24 million Yemenis are in dire need of humanitarian aid, including 10 million suffering from extreme levels of hunger.