There were tears of delight and unexpected kitchen floor deliveries as 2017's first bouncing babies arrived into the world.
In Dublin, twin boys, born within six minutes of midnight, were among the first arrivals.
The eldest, weighing 2.6kg, was born at one second past midnight at the Rotunda Hospital in Dublin, while his 2.8kg younger brother was born at six minutes past midnight.
In the National Maternity Hospital, a baby boy named after the late actor River Phoenix and animator Walter 'Walt' Elias Disney was born 50 seconds after midnight.
The parents of Arlo River Elias, Elton Rooney and Stacy Kenny from Clonsilla in Dublin, were thrilled with their "perfect" baby boy after an emergency caesarean section.
"It was getting nearer and nearer to midnight and we were looking at the clock thinking, is this going to happen - I couldn't care less if it didn't. Then it was a quarter to. I said 'what do you think, can we do this?' yeah it's on the cards," Mr Rooney said.
The couple's other son is named Axel after the lead singer of Guns N' Roses - Axl Rose.
In Limerick, a surprised mother gave birth on her kitchen floor three weeks before her due date.
Aine Laffan (34) from Lisnagry, had wanted a home birth, but wasn't expecting her child to arive so quickly. Odhran arrived weighing 3.1kg - and looking for his breakfast.
"I'm feeling great, tired, but great. I'll never forget it; I had him in the kitchen, on the floor. We'll never be able to look at the spot on the floor in the same way," she said.
Proud dad Denis Kelly made a late-night dash from his family home in Roscommon to be with Aine, and as it turned out, he was in plenty of time to "catch" his son who arrived at 4.42am. "I caught (Odhran) as he came out, and the ambulance arrived 10 minutes later," Mr Kelly said.
Aine and Odhran were taken by ambulance to the University Maternity Hospital Limerick for observation.
In the Rotunda 19 minutes after midnight, a baby girl was born and was greeted by delighted parents, mother Guo Yan and father Gao Xiao Yong.
The pair, who live in Clonsilla but are originally from north-eastern China, married in 2011 and are "very excited" to have their second child.
Couple Judy and John Turley were also over the moon when baby Molly arrived in the first 19 minutes of the new year.
The couple had a "hectic year", as they also got married in 2016.
"We thought she would come a bit quicker; she was due on Christmas Eve. It's great she was born on New Year's Day, it's very exciting and there's always a great buzz," the newlywed mother (34) said.
"The staff and the midwives here that delivered the baby were absolutely fantastic, they just couldn't do enough," Molly's parents said, praising the midwives in the Rotunda for their help and kindness.
Two MMA fighters from Navan, John Moran and Malgorzata Bialek Szymanska (36), had their first child together in the Rotunda at 01.37am.
The two met in the MMA club and were sparring partners.
"She punched me in the nose and that's how I knew she was the one," Mr Moran said.
Declan and Gloria O'Grady from Patrickswell celebrated the arrival of their first child, Lily Mary Eileen, who was born at the Limerick Maternity Hospital, at one minute past midnight.
She weighed 3.2kg.
"She was due on January 3 but it was a fine delivery; it lasted six-and-a-half hours, from 5.30pm to 12.01am," Ms O'Grady said.
Samantha (32) and Thomas (33) McDonald had their third boy at 23 minutes past midnight at Wexford General Hospital.
The couple have been married for six years and had been staying at the Talbot Hotel after her husband's sister's wedding when the baby decided to come.
"It was all go. My husband drove me in. I feel very good now, I'm delighted," Ms McDonald said.