A record 1 in 20 babies was born through in vitro fertilization treatment in Japan in 2015, a recent tally showed.

The upward trend in the number of IVF treatments is expected to continue as more couples are marrying later in life and increasingly turning to infertility treatment, according to experts.

The survey by the Japan Society of Obstetrics and Gynecology (JSOG) found a record 424,151 in vitro fertilizations were performed in 2015, resulting in 51,001 births, also an all-time high.