Sounds like common sense to me, considering women use the bathroom more frequently than men and use toilet paper for more things than men - but here’s a source I found after a quick Google that says the same thing.

As for the “women use baby formula more than men” - maternity leave is often longer than paternity leave (if it even exists). So women are by that very fact more likely to be feeding the baby, simply because they spend more time with the baby during that maternity leave. According to the International Labour Organisation, 98 countries meet the ILO standard of at least 14 weeks maternity leave and 107 countries finance maternity leave cash benefits through social security. Compared with paternity leave, which is found in 78 countries, and only five of those countries provide paternity leave for more than two weeks. So of the percentage of babies who receive formula milk alongside or instead of breast milk, there’s a fairly good chance that - at least in a heteronormative household with a father and a mother - the mother is doing more feeding and so using formula more than the father.