But seriously, congratulations on getting to that level of bonding with child. It was also the same for me and it is magical!
I think, from my own experience, babies learn to communicate in a two way fashion - they try noises and responses with their caregivers, and when the caregivers respond in an agreeable fashion, the baby stores that bit of communication away to try again later (and possibly reinforce).
So I think some of their communication is learned (signals for positive/negative), and quite specific to the baby-parent pair, while some will be instinctual (e.g. I imagine the excited kicking to be related to an adrenal surge or something, and early-infant crying is definitely an instinctual distress signal)
A surprisingly common problem with very young children. Maybe also some adults.
Screaming at night = “my parents are bad they aren’t feeding me they should be locked up”
Kicking feet = “oh god I’m wet please change me it’s so gross”
lol I remember this, we called it the 'worst parents in the world' cry. It continues forever, the form changes as they get older but the message is the same
Then again I did notice I was very good at understanding baby talk.
Taking from some old notes of my 5 month old baby:
"eh eh eh", but no crying at 6 AM = "I need a diaper change" or "I'm hungry"
rapid kicking = excited
wide open arms while lying down = "pick me up"
"uh huh/mmm" with slight head inclining = yes.
when mother is saying something, baby laughs, turns head towards me, "uh huh/mmm" with inclined head = "mother is right" or "I told you so"
laughing and turning away = "I like that"
licking lips = "I want to eat whatever you're eating"
"aaaaaaaaaaa" = conversation or song
long, drawn out, angry crying = "I'm tired and I don't know how to sleep"