Can bad posture cause upper back pain which can lead to upper abdominal pain?

[Ariestarz]

I have a 2 yr old which i carry a bit to often. I suffer sometimes with upper back pain which i feel in ma upper stomach directly where pain is felt in back. it also feels sore and numb after awhile (upper abdominal). was wonderin is this caused by carrying toddler and i also sit at a desk 6 hrs straight..or could this be something else