The frequent carrying, lifting, and breast feeding of babies can often result in back pain for new moms. The American Academy of Orthopaedic Surgeons recommends avoiding bending over during nursing, placing a pillow on your lap to help raise baby to your level while nursing, using an upright firm chair instead of a soft couch, and remembering to remove the tray first before lifting a baby out of a high chair.
American Academy of Orthopaedic Surgeons, October 2015