My son has changed

Since 18 months to 20 months, my son's behavior has changed in many ways. I'll write down some to remember.

• He stopped eating much (temporarily)
• He doesn't eat the foods he used to like on some days
• He started sleeping through the night more
• He cries hard middle of night (having a nightmare?)
• He started practicing jumping
• He started clapping/stomping/dancing to music
• He stopped hugging me when he saw me first thing in the morning (a little sad)
• He started pointing and demanding by saying "Milk!"
• He's starting to say "No" to many things and has stronger opinions.
• He sits down and doesn't move when we leave the park or mall
• He seems to be getting taller
• His vocabulary has increased significantly (upper and lower case ABC's, recitation of aiueo, animals, food, vehicles, household items, emotions etc., numbers)
• He look into people's faces to check them out (because there are many different races?)
• He likes to play with water in the sink.
• He says "Cheetah!" and runs.