Hello L.,
I have three children, Willy (7), Braden (5), and Madison (3), and they are all different, they all developed at a different pace. My oldest son was always the smartest, he was so clear when he spoke, he learned his letters and numbers and how to read and write earlier than anyone we knew, at seven he even knows how to use a chop saw and measure out wood. But my other son, we couldn't understand much of what he was saying until about a year ago, which was when he was four, the doctors in NY wanted to have me take him to a hearing specialist, and see someone about his learning, but as his mother I knew that it was just him, and he would grow out of it, and he did. My daughter is super smart, but she mumbles instead of talking, and she does it with her head down, and pouty lips, so I know that if she really wants something she'll eventually speak up so I can hear her, cause she knows she won't get anywhere otherwise. My middle son has definitely grown since then, and now he won't stop talking, and sometimes I wish it wasn't as clear as it is, lol, all moms understand the things that can come out of a five year olds mouth. But my point is, he is your son, and you need to do what you think is best for him. All kids develop differently, and most of the time girls are faster than boys, most of the time. Try not to make comparissons between the two, I know it's hard, but doing that just makes it harder on you because then you'll worry about why he's not doing what she did at that age. The best thing about having more than one child, is seeing the difference between all of your children, and knowing that each of them is a reflection of you. But like I said before, you do what makes you feel better, but maybe give him some time, some children take longer than other's, I found that out, but my husband was just like you, he was worried about him, and I said no, he's ok, it's just him. I hope that helps, you take care.
Candi ;O)
BTW, my mom went through the same thing with us, I have two brother's, and I was so quick to talk, but my brother's just flustered my mom because they wouldn't, or atleast not clear evough for her to understand, and they are both in college now.