In 1909 and 1910, the Infants played as members of the Class D level Illinois-Missouri League, hosting home games at Schmoldt Park.
[1] Joining Beardstown in the six–team league were the Canton Chinks, Galesburg Boosters, Macomb Potters, Monmouth Browns and Pekin Celestials teams.
[4][3] Beardstown's Andy Lotshaw led the 1909 Illinois–Missouri League with a .329 average, 146 hits, 14 triples and 72 runs scored.
[3] When the Class D level Northern Association folded on July 19, 1910, the city of Jacksonville, Illinois was left without a team.
[8] The Jacksonville Jacks resumed play and the team had an overall record of 44–36 in the Illinois–Missouri League when the franchise folded on August 17, 1910.