A little spotting here and there is common. It may be your body's way of telling you that it's gearing up to have a fertile cycle. Or it may be a side effect of hormonal contraception (pill, mini-pill, patch, ring, Mirena IUD), if you're using that.
Often a mom's fertility will return when her baby starts sleeping long periods at night. 6 or more hours without nursing is usually enough to allow your estrogen levels to rise high enough to bring back your cycle. So if your baby is sleeping through, you might want to start waking him.
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!"