sunken soft spot

Saige • 15 ✨ | Isaac amaro 👣 | 10.14.16 😍 | Blessed 💙
I heard a sunken soft spot is a sign of dehydration but I get about 15 wet diapers everyday, He is eating 4 oz every 4 hours sometimes 5. After I feed him maybe about 20 minutes later it won't be sunken in anymore. He also has red Blochy skin