US Ambassador Nikki Haley told the council that UN demands for a ceasefire, access for aid workers and a return to political talks had been "totally ignored" by President Salva Kiir's government.
"I call on this council to move forward with the tools available to it, such as with further sanctions and an arms embargo, or the violence and atrocities will continue," Haley said.
"We must tell the South Sudanese government that we are not going to put up with this anymore."
The previous US administration failed in December to win support at the council for an arms embargo and sanctions, with Russia, China, Japan and Egypt among eight countries that abstained in a vote on the measures.
Haley's remarks indicated that the new US administration would try again to push for an end to weapons sales and sanctions on those who undermine peace efforts.
"If you want to continue to see starvation in South Sudan, doing nothing is exactly what you need to keep doing," said the US envoy.
UN envoy David Shearer earlier told the council that the situation was dire after more than three years of war.
"Virtually no part of the country is immune from conflict. Yet there has been no concerted effort by any party to adhere to a ceasefire," said Shearer.
"Instead, over the past month, we are seeing an intensification of the conflict."
After gaining independence from Sudan in 2011, South Sudan descended into war in December 2013, leaving tens of thousands dead and more than 3.5 million people displaced.
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