keyword

first cousin marriage birth defects

Monthly search volume and cost-per-click data for "first cousin marriage birth defects" in US.

$ curl "https://api.seodata.dev/v1/keyword?q=first+cousin+marriage+birth+defects&country=us" +--------------+------------------+ | volume | 1,300 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-06-30 | +--------------+------------------+

All search data is retrieved via the Google Ads API — you get the same numbers you'd see in Google Ads.

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
first cousin marriage	1,300	$0	12/20
marrying first cousin	390	$0	13/20
first cousin marriage birth defects list	140	$0	13/20
cousin marriage and birth defects	70	$0	19/20
cousin marriage birth defects	70	$0	19/20
do cousin marriages cause birth defects	70	$0	18/20
does cousin marriage cause birth defects	70	$0	18/20
does marrying cousins cause birth defects	70	$0	15/20
genetic problems in cousin marriages	40	$0	13/20
first cousin birth defects	30	$0	13/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://api.seodata.dev/v1/keyword?q=first+cousin+marriage+birth+defects&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt