These new bat requirements go into effect Jan. 1, 2018.

Here is the official document from Babe Ruth on the transition from 2017 to 2018 (Note, refer to the chart to see what is changing):

https://www.baberuthleague.org/bat-rules.aspx

New bat rules go into effect Jan 1 2018, so it is likely that you will need to buy a new bat in the Spring. Bats that meet these standards (USA Bat stamp) will be available to purchase as of 9/1/2017.