4 month sleep regression

I read somewhere that it's better to see the 4month sleep regression as pro-gression as your baby is starting to development more of a sleeping cycle, which I thought was a nice positive spin on it. 

Our little one is 15 weeks and has started to go longer stretches at night, 7-8hrs. He feeds at 7pm, bath, rest of bottle then bed for 8pm and is waking around 3am for a feed which is brilliant. 

Did you noflticably go through the sleep regression? How many weeks did you notice it? I feel like his night sleepnis good, touch wood, however sometimes he can fight his naps during the day, so hoping this is our 4 month sleep regression.