Sometimes men just feel too much pressure to perform when they have been working hard, you say you want another baby, that too will be at the back of his mind thinking what if!
a)it doesn't work,
b)it does work!
this will be added pressure, try to change the way you aproach the subject, if possible try and arrange time on your own, get the inlaws, your parents or a good friend to look after your child for the night, go out, enjoy something you both like to do, go for a meal, go to the pictures, go to a pub if that's your thing, make it something you both used to do before your child came along.
Things should progress from there..if they don't, then not to worry, at least you will have started the ball rolling or at least the fire started, and maybe something will happen later.
My own husband felt 'uncomfortable' when the children arrived, (first child was nine months old when we caught with twins)every noise would make one of us startle, thinking, Oh god they may walk in on us, we may wake them up, but it will get better, Men are after all a species unto themselves....
I read a joke in a national paper the other week,
How to make a women love you..
a)Give her flowers,
b)buy her expensive gifts,
c)take her out for a meal,
d)tell her you love her,
e)listen to her,
f)agree with her,
g)watch a film with her,
h)cook a meal for her,
i)tell her she looks beautiful,
How to make a man love you..
a)Show up naked with beer...
Hope that helps.