トミーはもう首が据わったの!
Tommy can now hold his head up!

 あら、うらやましいわ! いつジムの首が据わることやら…
Oh, I'm so jealous! I wonder when Jim will be able hold his head up.

 抱っこしてるのがとても楽になったわ。ほら、もう頭を支えてなくていいから。
It's much easier to hold him now. You know, because I don't have to support his head anymore.