The rookie New Jersey state trooper who saved an infant's life this week says the ordeal was an "emotional roller coaster" — and one he's thrilled had a happy ending.

Trooper Benjamin Hockin of the Kingswood Station was the first to arrive at an Alexandria Township home just before 7 a.m. on Saturday, Oct. 3, State Police said. He used an an automated external defibrillator from the back of his patrol vehicle on Lila Wolfram, who was not breathing and not responding to CPR being administrated by a family doctor, state police have said.

The trooper, who graduated the 155th New Jersey State Police Recruit Class this past February,applied one shock to the girl's body and then performed CPR until Milford-Holland EMS arrived, State Police said. The EMS applied a second AED shock and took the girl to Hunterdon County Medical Center in Flemington. Lila was later transferred to Children's Hospital of Philadelphia.

"We go through a lot of training down at the academy, including CPR training, and I'm very happy that I paid attention and learned how to use the AED," Hockin told Fox 29 in Philadelphia.

Hockin has only been a State Police officer for as long as Lila has been alive — as she was born in February.

"Emotional roller coaster's a good way to put it," he told the station. "I was very uncertain. I've never had to give CPR before, never mind to a little baby. I wasn't sad, but just keeping hope, and when I found out, I couldn't be happier."