A. Congrats, this will be the ride of your life enjoy it, children are such a blessing. You have received very good advice, here are my two cents. I just went through this I had a baby girl in Feb and my oldest turned 2 in Jan. Know that you can do this and you will do fine. You will love them both for who they are and the joy they both bring to your life. Also know that 2 yrs and 5 mo is young, they do understand a lot of things but there are things they won't be able to comprehend. Do everything you can to prepare your son for the arrival but know that it probably won't sink in with him until that baby actually comes. I used the Dr. Sears book titled Baby on the Way it was very good but again while my daughter looked and acted excited it really didn't sink until the actual arrival of the baby. Not sure what kind of relationship you have with your son, ie is he very close to you etc. I was/am with my daughter so when the baby came there were minor issues, when she actually came to the hospital to see me and meet the new baby she didn't want to do anything with me, she wouldn't even kiss me or sit near me I was sooooooo heart broken I still get teary eyed as I write this. It took her about 2 hrs in the hospital to come and sit with me and want to be near the baby. I made sure that when she arrived I wasn't holding the baby, the baby was in the bassinet as per the advice I got from books/internet/etc. but still she didn't act as happy as in movies or as I was expecting. This is to tell you to be prepared for anything and everything and keep in mind that he loves you very much this is just a big change for him of having to share you. I also nurse so that made it a bit more complicated so keep this in mind if you plan to do the same.
Things you can do to cope and help your son is let him be with the baby, don't reprimand him for being rough unless he is really hurting the baby. Babies are very resilient and stronger than you think so your 2 yr old won't hurt him/her by poking at him/her touching the soft spot etc use your judgement. I even let me 2yr old hold the baby and she loved it. Engage the big brother role as much as you can, it makes them feel important. Have him get you the wipes, the diaper, the cream etc. I have my 2 yr old put the diaper cream on the baby of course she puts the cream everywhere but where it needs to go :o) but that is part of the process. After 3 mo she is not as curious because I did let her curiosity take over from the begining so now she is over it, she would even help me give the baby bath and now she is more interested in watching her tv show. Our daughter was increadible with the baby however she changed a lot with me and my hubby, but specially me since I am the one that spends the most time with her and I can tell you it hurts as heck but again remember is therir way of letting you know they are dealing with change. Your 2 yr old will test you in every way he possibly can but keep in mind that he loves you. My life has kind of returned to normalcy what ever normal is for me now and my daughter (the 2 yr old) is back to being my little girl. So in our case it took about 2-1/2 to 3 mo for her to adjust to our new life as a family.
Now while I think all mothers feel at some point or another that they are not good enough, those feelings certainly became very frequent for me during the first month of adjustment. Having my 2yr old asking me for my love and attention and not being able to provide it on demand was certainly heartbreaking.
Hopefully this will help you and let you know that you are not alone and everything will go back to a new definition of normal for you :o) Again congrats and many blessings to you and your fam.