About Sage & Sprout
Free, evidence-based tools for pregnancy, fertility, and newborn care.
Why we built these tools
Pregnancy comes with an overwhelming number of questions: When is the baby due? How far along am I? When is the best time to try to conceive? How much weight gain is healthy? Most tools that exist either bury the answer under ads and distractions, or give you a number without any explanation of where it came from.
Sage & Sprout was built to do one thing well: give expecting and new parents accurate, clearly sourced answers in a calm, uncluttered environment. Every calculator uses the same formula your obstetrician or midwife uses, cited to its primary source.
Who we are
Sage & Sprout is authored and reviewed by a senior medical student at an Ivy League institution. The site was built specifically because medical training gives a unique vantage point: access to primary clinical literature, an understanding of how guidelines are derived and how to apply them, and a responsibility to communicate health information accurately.
Important context: the reviewer is a medical student — not yet a licensed physician. These tools do not constitute medical advice, and the content on this site does not establish a doctor-patient relationship. All clinical figures are cited to authoritative primary sources (ACOG, AAP, NIH, CDC, IOM/NASEM, ASRM, US DOL). Please always discuss your individual situation with your own healthcare provider.
How we source and review content
Every calculator on Sage & Sprout is built from primary medical literature and professional society guidelines:
- Due date and gestational age: ACOG Committee Opinion 700
- Ovulation and fertility: ASRM guidelines; Wilcox et al., NEJM 1995
- Pregnancy weight gain: IOM/NASEM 2009 guidelines (coming soon)
- Baby growth: WHO Child Growth Standards; CDC Growth Charts (coming soon)
- Feeding: AAP and HealthyChildren.org recommendations (coming soon)
- Maternity leave: US Department of Labor FMLA guidelines (coming soon)
Content is reviewed before publication and updated when guidelines change. Each tool page shows the date it was last reviewed and links directly to the primary sources we used.
Our commitment to accuracy
We take accuracy seriously — particularly because this is a YMYL ("Your Money or Your Life") site where inaccurate information could genuinely affect someone's pregnancy decisions. Our approach:
- Every clinical formula is derived from the cited primary source, not a secondary reference.
- Calculator logic is written in testable TypeScript with unit tests against worked clinical examples.
- All content carries a clear medical disclaimer and a "talk to your provider" call to action.
- If you believe anything on this site is inaccurate, please contact us — we will review and update promptly.
Privacy
All calculations happen in your browser. We never transmit your dates, cycle information, or any personal health data to a server. The only data practices to be aware of are those described in our Privacy Policy (standard analytics and, in future, advertising cookies from our ad network).
Contact
Have a question, a correction, or a suggestion for a new tool? We'd love to hear from you.Get in touch →