Head down! My baby has moved!

So I wrote on here previously about my son being breech. My doctor decided to check baby positioning because I'm measuring a week ahead, and he is running out of room. Well my little fella has moved head down and is very low! I am still at risk for preterm labor so no work ☹. I know he can flip back anytime but I was really hoping he would be head down by now. Oh and my little man is weighing almost 5 pounds at 33 weeks! (4pounds 14ounces). It is so hard to believe as my twin nieces were 5 and 6 pounds. So to think my son is about my niece size blows my mind!