The U.S. birth rate went up for the first time since 2014, in a marked reversal of the decline seen earlier in the pandemic, according to newly released CDC data.

Driving the news: U.S. births had been declining by an average of 2% every year since 2014, and plunged 4% in the early phase of the pandemic, from 2019 to 2020, per the report.

The big picture: More than 3.6 million babies were born in the U.S. in 2021, a 1% increase from 2020 levels.

The state of play: The percentage of premature births also hit its highest reported level since representative national data became available, according to the data.

The big picture: There could be multiple reasons for the trend lines, including the underlying health of the mother, access to care, socioeconomic factors and the use of fertility treatments.