Can only say from my experience that our wee experiences were more likely to be at the front, and that as long as his penis was facing south in the nappy (also Huggies) we didn't have problems with wee leakage. Again, in my experience, the huggies seem to be able to absorb huge amounts before wetness becomes an issue. Poo is a different case - that can definitely squirt up the back, but that's easier to tell!
Don't worry so much about checking his forehead for temp, baby foreheads are notoriously unreliable for temp. Instead, feel his torso - I would say that if that feels clammy then he's probably too hot.
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