That is very unususal behaviour for him to display.
The new baby (even 6month ahead!) will be causing him stress and upset, it can take them a long time to adjust. Just remember he has had your divided attention for how long you have had him for (3 years if you had him from a kitten)
This display may have been play for him (he will not relise that this is innapropriate behaviour) Can you be certain that this was not play, if so then it probally had something to do with the attention that you gave him.
Cats think that they are the masters of the world and everything is always on their terms,
- He approached you, you stopped and gave him attention ( his terms)
- You played and petted him for a minute (his terms, its what he wanted you to do)
-He walked behind you and you didnt carry on interacting with him as your back was facing him ( iknow that he walked around you but he wanted you to follow - NOT HIS TERMS , you made the decsion.
Can you understand the process? This type of behaviour doesnt happen very oftern but to minimise it occuring again please try to do thing on your terms and rules. You decides when he eats, not him so if he is pawing at the cupboard door where the food is , only give it to him when he has lost interest,
You decide a time to approach him and pet, play with him not Jasper.
It can be very difficult but ignore him when he approches you and just as he walks away then you can interact, as the action has imeddiatley switched roles , you made the descicion to interact with him.
Please try this for a few weeks and see if it makes a difference, if not he may have just been in a bad mood, or not feeling too great, please ensure he is healthy , fit and well just incase he was trying to tell you something.
Hope this helps
