Trucks goes out of park to easy

[conoco]

I had my 2 year old in his car seat and we were driving around town for the day. When I got home i parked the truck and went to get him out of the passengers side because it is easier. His car seat only fits in the middle section of the bench. This little guy managed to kick my shift lever and it went into drive. I luckily was on the flat concrete pad at my house but there has got to be a fix for this.
I guess I never really noticed how easy it was to put into gear. Are all the trucks like this? If I remember correctly don't you have to pull back on the shift lever to then put the truck into drive? Can anyone tell me if I need to replace a part of something so this does not happen and have a bad result. Like parked on an incline. Thank you