What does Birth Before Arrival (BBA) mean?

array(2) { [0]=> object(WP_Term)#22894 (10) { ["term_id"]=> int(304) ["name"]=> string(4) "baby" ["slug"]=> string(4) "baby" ["term_group"]=> int(0) ["term_taxonomy_id"]=> int(304) ["taxonomy"]=> string(8) "post_tag" ["description"]=> string(0) "" ["parent"]=> int(0) ["count"]=> int(2) ["filter"]=> string(3) "raw" } [1]=> object(WP_Term)#22875 (10) { ["term_id"]=> int(335) ["name"]=> string(26) "Birth Before Arrival (BBA)" ["slug"]=> string(24) "birth-before-arrival-bba" ["term_group"]=> int(0) ["term_taxonomy_id"]=> int(335) ["taxonomy"]=> string(8) "post_tag" ["description"]=> string(0) "" ["parent"]=> int(0) ["count"]=> int(1) ["filter"]=> string(3) "raw" } }