do you remember your younger sibling being born, or anything about the new baby joining your family?  I'm interested to know if that is old enough to have formed some good memories of that time period.
I'm only 20 months older than my sister and I have no memory, but I'm hoping that older kiddos did. 
Re: if you are 3 yrs older than a sibling...
(read it. you know you want to.)
anderson . september 2008
vivian . february 2010
mabel . august 2012
Aw, that's so sad! I remember having to poo in my pants (I was a little older, though, like 4 or 5) because we only had 1 bathroom in our ancient house growing up in NJ. And it only had a tub, no shower. My dad would fall asleep in the bath in the mornings, and one morning I had to go SO bad, and he had locked the door, fallen asleep (which I realize now - holy cow! How dangerous!) and I couldn't get in. I remember crying outside the door as I had to crouch down and do my bidnez in my panties.
Anyway, good question, OP! I wonder the same thing, and I can't help but think there's no WAY he'll forget, because he is so super aware of the pregnancy and so so excited about "his" baby coming, etc. It would be sad if he didn't remember. I'll have to do a very specific blog post about it, one of these days....
When 3 Became 4
BFP 12.20.2010 :: missed m/c 1/2011 around 8 weeks
BFP @ 9dpo 5.24.2011 :: missed m/c 6/2011 around 7 weeks
positive for ANAs (1:40) with a speckled pattern
MTHFR c677t mutation (heterozygous)
*folic acid, baby asprin, Prometrium, acupuncture, Lovenox*
BFP @ 9dpo 2.1.2012 || HCG = 8 : Progesterone = 19.2
2nd HCG @ 11dpo = 40 || 3rd HCG @ 21dpo = over 5000!
Stick, little one, stick! EDD October 15, 2012
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I am three years and three days older than my brother. I don't remember much about my brother being born, but I do remember some of what happened when my mom and he were still at the hospital - stuff like my dad coming to get me at home early in the morning (I guess grandparents were watching me?) and stopping at a gas station on the way to the hospital and my dad buying me one of those little packages of chocolate donuts (a big treat for a three year old!!). I also remember going to the grocery store with my dad in the same time frame and choosing with him to purchase this little picture frame magnet for our fridge that was the right size for my brother's hospital portrait.I remember being seriously excited about getting a baby brother.
I don't actually remember my brother (other than being able to picture that portrait in my head, but I think that's just because it hung on our fridge for so long), the hospital, or any of that type of stuff at all - just the short bits of time with my dad. I think these are probably my earliest memories.
**the nestie formerly known as karen2508**
My favorite memory of sister as an infant is when her crying woke me up one night. I walked to my parents room and asked "can you PLEASE make her stop crying??" my mom (who I was exhausted, I'm sure) said "I would love to make the baby stop crying, but I'm not sure how". I could not comprehend that she couldn't know how to fix the baby.
"The House We Built."
A journey of building the dream.
I'm 4 years older than my sister and 6 years older than my brother, and don't remember either of them being born
I remember "helping" my Mom with my brother, and changing diapers, etc. That's about it, though. Granted, I have a horrible memory.