N.J. Stat. § 17B:27-63
If a group health plan makes coverage available with respect to a dependent of an individual who is a participant under the plan or has satisfied any waiting period and is eligible to be enrolled, and the dependent becomes a dependent of the individual through marriage, birth, adoption or placement for adoption, the group health plan shall provide for a dependent special enrollment period during which the dependent and individual, if necessary, may be enrolled.
The dependent special enrollment period shall be for a period of not less than 30 days and shall begin on the later of the date dependent coverage is made available or the date of marriage, birth, adoption or placement for adoption. If an individual enrolls a dependent during the first 30 days of the dependent special enrollment period, the coverage of the dependent shall become effective: in the case of a marriage, no later than the first day of the first month after the date the completed request for enrollment is received; in the case of a dependent s birth, as of the date of birth; and in the case of a dependent s adoption or placement for adoption, the date of the adoption or placement for adoption.
N.J.S. § 17B:27-63