Growing boy

Well at 4 months, Tom is already out of the bassinett and sleeping in the travel cot. He tries his hardest to free himself from his wrap and has an almighty kick on him. Not much has changed on the hair front....we're still unsure whether he'll be a red head or not, and he still has craddlecap.
What has changed is his eating and sleeping. After thinking i had conquered it, with 4 hourly feeds ans sleeping from 7pm till 4am, he has gone back to feeding 3 hourly and waking at all hours. last night we had 1am, 3 am and 5am!!!! Exhausting.
I would start him on solids as I think he needs them, but I want to put it off till after our plane trip next week. I had started supplementing with formula too but that has messed up my body and possibly his routine. Who knows.
He has found his voice again and loves to lay in his cot at 5.30am and warble at the top of his lungs! No rolling yet - but I've found him turned by about 45 degrees in his cot some mornings.
On our recent holiday to Port Macquarie, Tom enjoyed a few swims in the pool. Not sure whether he actually liked it though. He has also become much more aware of his surroundings. Which is a nuisance at feeding time when he starts nosing around, and yesterday i watched him reach out to one of his toys and watched his face become wide eyed in realisation that he had control over his hand as he touched the toy. Very sweet.
He is also becoming more difficult to get to sleep - patting and rocking have no effect - just loves his dummy and lets you know about it when it's fallen out.