# The Sex Calculator Retro Trend of the Past By Alex Covert | Published 2007-07-12 | Unique Source: Trend Hunter, https://www.trendhunter.com/trends/past-trend-its-a-boy References: [patft.uspto.gov](http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=HITOFF&p=1&u;=/netahtml/PTO/search-bool.html&r=1&f=G&l=50&d=PALL&RefSrch=yes&Query=PN/1428065) U.S. Patent Number 1428065 is a [sex calculator](https://www.trendhunter.com/trends/partner-probability-calculator). This was a device for [predicting the sex of your child](https://www.trendhunter.com/trends/the-ai-baby-generator) that was invented by HUBERT BOYDS TIDSWELL in 1920. Here's how it worked: you had to have already had a child, know its gender, and know the [birth date of your unborn child](https://www.trendhunter.com/trends/cycle-ovulation-powerplug). Voila, you're having a boy. How does such knowledge get lost in the sands of time? **Implications** - It is important for modern innovators and developers to reflect on the history and evolution of technologies and explore the roots of their topics of interest as they build new concepts. The development of technology is happening so rapidly, and looking to historic developments in particular fields helps to inspire new innovation and reflect on the significance of this growth. ## Trend Insights (Trend Hunter) - Score: 3.9/10 - Popularity: 50% | Activity: 58% | Freshness: 8% - Audience gender: 50% men, 50% women - Primary generations: Millennial - Top markets: North America, Europe ## Categories [Trend Hunter](https://www.trendhunter.com/trends) > [Unique](https://www.trendhunter.com/unique) > [Bizarre](https://www.trendhunter.com/bizarre) ## Key Themes ### Why This Trend Is Growing - **Retro Trend:** Explore the revival of retro trends as a source of inspiration for new innovation. - **Evolution of Technology:** Reflect on the history and evolution of technologies to inspire new concepts. - **Significance of Growth:** Consider the significance of rapid technological growth by examining historical developments in specific fields. ### Industries Being Reshaped - **Consumer Electronics:** Leverage the revival of retro trends in consumer electronics to create nostalgic and innovative products. - **Healthcare:** Apply the evolution of technology in healthcare to develop new medical devices and predictive tools. - **Childcare and Parenting:** Explore the significance of technological growth in childcare and parenting to create advanced tools for predicting and managing child development. ## Related on Trend Hunter - [Chronological Age Calculators](https://www.trendhunter.com/trends/chronological-age-calculator.md) - [Pregnancy Due Date Calculators](https://www.trendhunter.com/trends/pregnancy-due-date-calculators.md) - [Exact Age Calculators](https://www.trendhunter.com/trends/the-age-calculator.md) - [AI-Powered Calculators](https://www.trendhunter.com/trends/calculator-concept.md) - [Time Span Utilities](https://www.trendhunter.com/trends/age-calculator.md) - [Phenotypic Age Calculators](https://www.trendhunter.com/trends/phenotypic-age-calculators.md) - [Numpad-Style Calculators](https://www.trendhunter.com/trends/denten.md) - [Retro Calculator Watches](https://www.trendhunter.com/trends/ca500webf.md) - [Match Likelihood Tools](https://www.trendhunter.com/trends/partner-probability-calculator.md)