Dummy advice

[Reecex]

Hi
New mum here, completely new I may add seeing as children were never in my life plan so I am in need of some help because it seems like I know nothing!

My son is 4 weeks old and I've never seen a baby suck on a dummy like this before

He sucks so hard and fast and when you give him the dummy the surface almost goes in his mouth

The dummies for 3 months plus are too big in the tit size but I'm looking for a dummy with a bigger surface of anyone has any suggestions?