Answer:
I believe that the Baby needs to be burped. If a baby isnt burped it builds up air and gas in the stomach making it uncomfortable for babies. They tend to hold their legs up in the air to pass gas.
Hoped this helped
I would say its Sleep Habits ,Vaccinations,Nutrition
A. social exclusion - ignoring someone
B. Positive reinforcement - smiling when someone does something good
C. Emulation - Doing what someone older does
If you look up the definition of emulation, exclusion, and positive reinforcement it is very clear which matches up together.