hi there!

my paed gave me the best advice. (i had 2 under 15 months).

He said regardless of whether they are tired or not, wrap and put them to bed EVRY 1.5hr-2hrs.
yes it makes for a boring social life but, as soon as i started doing this - he was sleeping so much better during the day.

for ex.
if he slept 8am -8.40am - he would be back in bed by 930.
if he slept 8am -9.20am - he would be back in bed by 10.

never ever kept him up longer than 2 hrs - even if it meant he was only awke for 40mins at a time.

also try to keep to a strict routine,

DS also was colic and reflux (he was waking every 2 hours through the night too until 5months).
ANd i found i had to keep him upright as long as i could after a feed . Otherwise would get upset with wind and reflux pain.

i dont mean to say this is the same, but it helped.
I invested in a cradle swing and i would sit up right in that after a feed with a slight rock (to help burp) while i needed spare hands with my toddler.

the other thing i did was sleep on his belly from 2 weeks.
This helped him settle a heap better.

it is really trial and error. BUt yep for sure the 1.5-2hr rule worked a absolute treat for us, he got into routine and has been a dream ever since with his sleeping.

HTH