Sitting, singing and much more

So mom's been a bit of a slacker and not making note of some of your recent achievements. Last week sometime, lets say april 23rd, you sat up by yourself and were playing with your toys as if thats all you do! Today you tried pulling yourself up on your crib but bopped your head (softly) and sat back down. You probably would have been able to pull yourself up but you were suffering from your first flu attack which was the worst thing ever. You would just keep crying a low sad throaty cry that breaks everybodys heart. And besides that you have been making these continous sounds which almost sounds like you're singing along with mom! you are developing so much and so fast-- we just keep watching you!