hehehe ... sorry for the chuckle but I too was in that situation with my 5yr old dear. Recently DH went away to work up North for 3 months and my 5yr old had turned into a little monster whenever it came to doing something different. Going to the shops was a nightmare of a job. She would throw a tantrum from one isle to the next. I would carry on shopping with this child hanging off my trolley crying,growling, moaning and screaming at me around the shop.All the while I had a 8 month old in the trolley as well just enjoying the time out and not a peep from her! But my 5yr old well ..... You know the ones you see when you are out and you say to yourself - Oh dear, my child is never like/was like that.Or what did that woman do to that child to upset her so much.? hehe... Anyway, had to basically do what Purplemamma did and that was to just try to move away from the yelling back and forth and distract their attention to something fun. Learning to switch off from them is something I have gained over the years. This is my 4th child I am having as well. My 5yr old hasn't had a outburst in over a couple of months now. I also believe that they sense that with another sibling coming along that the attention is being switched as well. They are no longer the centre of attention from mum or dad. 5yr old tries to speak loudly or gain attention when anyone focuses on her little sis. More so when my 16yr old plays with her. Kids are a laugh and should be loved all times....I sit and laugh at my kids all the time, even when having a tantrum.. Don't worry too much about your little one, they do grow out of it at sometime.