8 week growth spurt?

So yesterday my LO slept a total of 13 hours. Last night was his first 7 hour stretch after having 1 teaspoon of night time gripe water (yay for some sleep!), but today since we've woken up all he has really done is eat and fall back asleep. From midnight to now he has already slept a total of 9 hours. Is this just a growth spurt and is he gonna be up all night or could he still sleep well tonight? He is breastfeed, but I don't know if that has anything to do with it!