Being attached to mom is 100% normal for young babies. It's not something you're "doing" to your baby, and it certainly isn't "spoiling" him. When it comes to advice about your parenting style, remember that advice is like armpits: everyone has some, and it usually stinks. So feel free to ignore, or to brush off unwanted comments with a breezy "You think so? I'm glad that worked for you. If I want more advice on that, I'll know who to ask. Now, let's talk about something else."
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"