www.askdrsears.com is a site that i highly recommend.
im sorry for your divorce. its horrible when things dont work out, and your son can sense that.
first of all, your son will adjust to divorce. right now, however, he has no way of understanding what is going on, especially if there is a tense environment every time mom and dad are together. you cant always help that, after all it takes 2, so do your best to leave the hard feelings behind closed doors and away from your son. im not saying you have to pretend to be all happy in front of him, just try not to fight and make him scared. i dont know your situation, maybe its a more plesant one than normal, so i apologize if im speaking unneccesarily.
ok, now on to the nuk and blankie thing. first of all, i am not at all opposed to these items. kids need something they can hold onto, and snuggle. i feel we shouldnt discourage this. after all, only your child knows his inner feelings and he should be allowed to make the choice to need them or not. HOWEVER there is a fine line somewhere, because i have a friend who has an 8 year old who hangs on to her see-through holey blankie and sucks her thumb. i dont feel that is age appropriate anymore....
however, your son is only 21 months old. in my opinion, theres nothing wrong with a child this age having snuggles, lovies, nuks, etc. they in fact may help prevent a lot of the behavioral problems of kids who have to 'grow up' too soon. kids grow at their own pace, regardless of what positions we put them in. having these security items are not harmful, they are helpful. especially during a time of great stress. your child may not know what is going on with mom and dad, but he knows that something is not right. that makes him nervous and uneasy. in my opinion, he NEEDS the blankie and nuk to help him comfort himself.
dr sears says in his books that an unfulfilled need shows up as an undesireable habit later. for example, i have a child in my day care who has never been allowed a nuk (in fact, he cant even suck hard enough to hold it in his mouth) and he grinds his teeth... all day, whenever he wants to comfort himself. OUCH! i would prefer the nuk.
if you take the nuk away, its likely your son will find his thumb. and you cant give that away. lol.
just be patient with your son and his needs. you may not understand them, but you should be respectful of them. the more we can respect our kids and their feelings, the better they will feel about us later. its all about building trust and the foundations for love and honor and respect. in order to 'teach' these things to our children, we must treat our children with those things. im not saying you dont, i dont know your situation, i dont know your family life. im just saying that in general if the country listened and honored the feelings of its children, maybe there wouldnt be so many angry kids ......
i myself dont remember having a sucker. i do remember having a blanket, mostly because i had it so long. when i was aroudn 4 my mother told me that if i wanted my blanket, i had to be in bed. pretty soon i got used to the idea that blankie was for bed, and i didnt get to just carry it around. as i was older, i put it inside of my pillowcase... and thats where it stayed, pretty much until college LOL. and i turned out to be a happy, healthy, confident adult, without any attachment issues. i still have it somewhere, but its certainly not 'in use'. lol.
anyhow, i would just be patient. when he is older, you can always have a lesson about the nuk fairy giving nuks to kids who dont have one... and the blanket will probably someday get lost or just plain forgotten as he grows and matures on his own. without it he might withdrawl from you, get angry, throw tantrums.... the possibilities are endless. only you will know when he no longer needs them. you can still insist that he only use them at bed or snuggle time. my son is 18 months and he has his snuggle bear and sucker. he only gets the sucker when hes really needing snuggle or bedtime. the snuggle he wants with him a lot, but he doesnt carry it 24/7 - he gets to playing and i will put it up on the table or something until he looks for it. its mostly about balance.. knowing when he needs it, and when he doesnt.. and just respecting those feelings.
i hope this makes sense, and i hope that you can have patience and the love for your son will help you do the right thing for both you and him. in my opinion, we cant force our ideas on our children any more than we can force them to be what we want them to be. they are who they are. we just 'fertilize' that and help it grow. lol.
when hes ready, you will know... and good luck!