Regarding the system of presuming paternity primarily based on the time of being pregnant and childbirth, if the kid is remarried, even when the kid was born inside 300 days after the divorce, will probably be presumed to be the kid of the present husband. The revised Civil Code will come into impact in April subsequent yr.
Source
Abolition of ladies’s “prohibition of remarriage for 100 days after divorce” from April subsequent yr | NHK
