Is 5 months too earlier to let them cry it out? What does too much codling look like?

Hi,I have a 5 month old that cries pretty regularly. Many times after being fed/changed/held etc. My wife and I split primary care through the week based on our alternating work schedules. I've noticed on nights I work she puts her to sleep and pretty much always ends up consoling her with breastfeeding. I have concerns that this is promoting the inconsolable behaviour. Am I wrong to be thinking this? When I care for her sometimes I let her cry it out, and often she quiets eventually. My wife gets up instantaneously. Am I doing harm letting her cry? via /r/Parenting http://ift.tt/2Flp1P8