I mostly used a weight tape, and from about that time frame I had Actual weights 49, 52, 55, 59, 64, 64, 64 pounds on July 13, 2018, putting them at about 112 days.
In early June, so a little closer in age to your goats I had girths between 22 and 25 inches.


"For some unfortunates, poisoned by city sidewalks ... the horn of the hunter never winds at all" Robert Ruark, The Horn of the Hunter