I was feeding Umar last night, and he was wriggling his hands and legs while repeatedly throwing his body to the back. This went on for a while, and it was quite hard to feed him.
While the food was in his mouth, he discovered something new as he was trying to squeal: gurgling.
Umar seemed to enjoy it, for he gurgled and experimented different variations for some time. Hehe...
Of course, the messy feeding session was cut short but continued later, by his mother (the best person to do it, it seems...).