Centre Sonny Bill Williams missed All Blacks training in Cardiff, instead staying in the team hotel as his first child, a baby girl, was born to his wife Allana.
All Blacks assistant coach Ian Foster says the couple made the decision for him to stay on tour during the birth.
Foster says Sonny stayed in the team hotel to monitor the birth which he says by all accounts went very well.
Foster says the birth hasn't caused any disruption to their preparations for the weekend's Test against Wales.
He says it is very exciting and as an All Black family they enjoy celebrating these events.
Williams said on Twitter that it was the "proudest moment of his life".
Foster says they also celebrated the birth of prop Charlie Faumuina's second baby girl last week.