Anyone else have a stiff little baby?

My baby boy had his 6 month appointment yesterday- my husband came with and can be a bit dramatic - he told the doctor our little man seems stiff. He doesn’t like to bend and sit very much. He usually likes to be In a standing position when held. He put his feet in his mouth all that but just seem like a tense little guy. The doctor didn’t seemed concerned but said he would have PT call us so they can look just to be sure - now I’m worried sick........ anyone else seem to have a stiff little bugger? Or any experience with this??