Worried about 6 month old not laughing.
All babies are so different. I used to constantly worry when one of my friends would tell me that their baby did something that Charlie was nowhere close to doing. So, as long as your pediatrician is happy with your little ones progress, don't stress! I see pictures of my friends baby who is only a month older than Charlie standing up at a table playing with toys.. Charlie is nowhere near that, but that's okay! Just enjoy these milestones as they come :)