Four month old Fisher

The other day, I had one of those, "my-baby-is-growing-up-too-fast" moments, as I realized Fisher is now 4 months old!  I thought, "4 months...he's almost 6 months...he's almost one!!!"
Luckily, that's not the case, and he still has quite awhile before he reaches that milestone.
For now he's just my little chunk who is happy all the time.
He is constantly smiling at anyone who looks at him, and it goes through his entire body like he can't contain his excitement, and he eventually is forced to look away as if he was being bashful.  I just love it.
Whenever he does cry, I let him let it all out for a little bit, just because I'm not used to hearing his sweet little cries. 
We are still working on consistent sleeping through the night, however.
He does well often, but it's still hit and miss with him.
I can tell he's anxious to get up and go play with his brother.  When I put him on his tummy, he starts to get up on his toes, and when he's propped up on a pillow on his back he tries to use his elbows to sit up! And this morning when he woke up, I found him about a foot closer to the head of his crib then where I left him.  He must have used  his little heels to push his way up!