Am I over reacting from the text he sent?

I know this sounds ridiculous but I’m dating this guy we’ve been seeing each other for 1 month and a half. It’s his birthday today and I said to him ‘Happy birthday enjoy yourself have a great day xxx’ and he just replied saying ‘Thank you babe I really appreciate it’ but I just feel like he could have said more? And he took 6 hours to respond yesterday. Am I being dramatic?
Am I over reacting from the text he sent?
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