At around your DDs age my DS2 was sleeping from 9pm to 7am (no dream feeds) as well as 3 2-3 hour day sleeps. He was feeding well, growing like a weed and was happy and alert when awake. Don't worry when things are going nicely. Just don't be surprised if they don't stay so perfect. It wasn't all that long afterward that DS2 started getting teeth and night sleeps went out the window. It may not be the case for you... but enjoy it while it lasts!