The tag alias #73619 both_pregnant -> multiple_pregnancies is pending approval.

Reason: We probably don't need separate tags for two characters being pregnant, and two or more characters being pregnant.

both pregnant seems to have been legitimised by the implications, (see topic #45727 and one of DDM's BURs)
One could argue that the tag would be useful to find 3+ pregnancies (and that it fits with the the multicolored tag scheme (two-tone_* -> multicolored))