My little Flynnie seems to be on the verge of crawling, but is also whining alot ATM. He has up till now been a really easy going bub but lately has got into a really whingy/sooky kind of mood. His teeth aren't through yet and he had his immunisations recently, but I don't think it is pain, more frustration. He does alot of his whining while writhing around on the floor. Have other bubs undergone similar mood changes just before a major change like crawling or walking?