Ay, I'd suggest checking with your pediatrician about this one, mama, sometimes babies develop their own quirky movements, but a consistently raised hand could be something worth having the doctor look at just to be sure, especially since baby is already 5 months old at na. A few of us moms have noticed similar things with our babies and it turned out to be nothing, pero mas peace of mind talaga pag na-assess ng doctor, kaya go na for a checkup!