If they are not given sufficient stimulation (a play companion will often help), they will probably dig holes in the yard and maybe even escape. (pethelpful.com)
I've found most these babysitters provide quite good physical care but don't understand how to provide sufficient stimulation for that baby's development. (maijasmommymoments.com)
The stimulation that occurs during nursing with an SNS (together with added stimulation from hand expression and / or pumping) may provide sufficient stimulation to initiate milk production, especially if the parent has previously breastfed (in which case this is called «relactation»). (breastfeedingtoday-llli.org)