Fully understand your situation. However, your baby still need time to build confidence with his/her parents, babysister and everything around. Overly ignorance only do more harm than good at this age. There are many tips from the Internet which help you to assist your baby to sleep through the night. Hope this can help you.
Thanks for your advice. I am also worried that this may develop a lack of insecurity in him. I am too guilty right now and will let it be for the time being. However, I will read the website and see there's anything that helps.
Really feel sorry when I hear your tiring experience.
Agree with other mummies that if you let alone your baby crying, he may feel so insecure which would hamper his self-confidence in the future. Don't blame yourself and I think you have already tried your very best. I know that if mummies & daddies are tense, baby can feel it and get nervous too.
Remember I read an essay about how to make baby sleep overnight. Here is some tips which you may want to try if you think your baby and you are ready :
1/ Be sure to feed your baby full before it sleeps so that he/she won't wake up because he is hungry- to do this, i have intentionally fed my baby at 11pm - 1130pm everyday and let him sleep even though his last meal was fed at 9pm
2/ Establish a habit to sleep - you can establish and do a series of steps repetedly every night before go sleep such as feed him, give him a kiss and say "good nite" and turn off the light
3/ Burn out his energy during daytime - when babies are tired, they will sleep longer. So, you may try to play with baby more during daytime and sleep less so that he is too tired and sleep for long. This is what a doctor told me before. I remember that your baby sleeps for 5 hr after that long and exhausting night you mentioned.
4/ Make sure your bay is having a comfortable environment to sleep such as the bed, the temperature, etc.
5/ Under some Chinese customs, my grandma sometimes go to the temple to "make a wish" and get back some "eng On Fu". You may want to try as an last attempt to see at your preference.
Hope the above will be useful to you and that's all I know. Maybe you have already tried all the above already. Anyway, all the best.