The Harper's Weekly text reads:
The double-page illustration which we give this week shows the administration of the "Sacrament," large pewter vessels, of which several may be seen in front of the pulpit, being used for the purpose. All present, men, women, children, and babies in arms, partake.On the left side, you can see two women breastfeeding. (Click on images for a high-res version.)
1) Public breastfeeding was accepted as normal in mixed company and during worship services.
2) LDS women breastfed in public without a cover or blanket.
3) The norms of dress at the time meant women unbuttoned their dresses at the chest area to nurse. In the closeups below, you'll see dress opened, exposing the nursing breast.
Breastfeeding History Moment: Mormon Handcart Pioneers
Breastfeeding in Church
Other people's posts on this topic:
Breastfeeding at church: now and then at Life Inspired
Breastfeeding and LDS Church at Improves With Age
Several posts from TopHat: Modesty and Breastfeeding, Sacrament Meeting 1871, & Inquisition Monday