Another good example is American 1420, crashed in Little Rock in 1999. A report from the NTSB states that a passenger in seat 24E with a restrained child "believed that it would have been impossible for her to hold on to her child during the crash had the child been seated on her lap"
See page 29 of this NTSB report:
http://www.ntsb.gov/events/2000/aa14.../AA1420_6A.pdf