Getty / Instagram @kourtneykardash Composite

Kourtney Kardashian is in some rough waters with fans after she posted a snap of her 21-month-old son Rocky Thirteen on a boat without a life vest.

Check out the pic ... she's lounging on the back of the vessel with her little one cuddled up in her lap. It's a sweet pic -- but fans can't help but notice Rocky's got no flotation device on all while the boat is in motion! Instagram / @kourtneykardash

Just check all the comments -- fans are begging KK to put a life jacket on her bundle of joy ... and in disbelief that she would post such a photo.

The snap was included in a photo dump the Lemme founder posted of a recent family trip, which let them enjoy some fresh air and boating away from the paps back in L.A. Instagram / @kourtneyka

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