i find Lincoln becoming more naughty lately, too. when we stop him from doing something or take away the stuff he is playing, he will get angry....
at first, when he got really angry, he even lie on the floor which i strongly said "NO" (now he stopped doing so, thank god~)
now, he stretches his arms hardly and say "NG" or shout
it all depends on his mood at the moment. if he is good, he could be a dear daring. but if he is naughty, u just wanna dump him away....aiiiiiii. i guess this is just a start.
Can u share what are the ways that u will stop bb from doing naughty things?