To the ppl who don't watch this show very much... It can't be shawns baby because Shawn and Belle have never had sex... This was one of the HUGE reasons shawn was [censored] with Belle in the first place. So if the baby isnt Phillips then the demiras messed with belle and shawn dna to create drama... which for Days, wouldn't seem to far off.
I don't think you watch the show very often then. Shawn and Belle did have sex. When they were on their way to Jan's house because Mimi had found the cage and their car crashed into the river. They went into that barn and they had sex. Belle just doesn't remember because she had hypothermia. So the baby is Shawns. It's the only way that Belle will leave Phillip and get back together with Shawn, and everyone knows that Belle and Shawn are the next major super couple. They are the Bo and Hope of this generation.