A., I have some really good advice for you. I had one child, got cancer and could not have more (Long story).
1. Daycare, Daycare, Daycare. Get that child around other children as early as possible. I am not kidding, please trust me on this. You want your child to begin communicating with other children right away.
2. Watch what conversations you have around your child. Your child may be young, and children already pick up enough, but single children, they pick up a lot more. My son began carrying on adult conversations at 3 years old. And with single children, it does not stop when they are young, they nose into every conversation you are having with another adult because they think it is thier business also.
3. DO NOT SPOIL YOUR CHILD. Do not buy them everything they want. Whether you can afford it or not, it is ok to tell your child "NO, you can't have it" I do not care if they have a temper tantrum or not. Do not give in. Teach them young not to interrupt conversations you are having with other adults or while you are on the phone. Do not let your child get thier way, or talk back to you, or tell you no.
I am trying to tell you this because if you let it go, and then you try to fix it when they are older, it is so difficult.
4. Try to get back to work. Although you love your child and love to be around them, with a single child, you should show boundries. You have your time for work,(or going to the gym, or whatever else) and then there is time for you and your child. Your single child will begin to expect you to always be home with them and take them everywhere you go, if you do not do this.
I am trying to save you a lot of problems, I hope this is something you will consider seriously ok?
If you have any other questions, I will be happy to help you with them.
Take care.