Not really sure wether I'm expecting too much or wether it's typical behaviour for DS's age...
DS is 3.3 years and his baby sister is coming up to 11 months and has just started crawling (maybe at the root of problem I think)
He has always been very kind to her, lent her his toys, put her music on in the car etc. However, since she has started crawling he's been very aggressive towards her (though sure he'd not hurt her). He'll always be watching her and shouts "That's not a toy" or similar at the drop of a hat, and woe betide her if she finds one of his toys! He also gets right in her face and growls is the only way I could descibe it. He's been doing this growling thing (teeth clenched, head shaking. I think it's his way of showing he's angry) for a while but never at her.
What really breaks my heart is to watch DD's little face so happy that she now has the means to go to her beloved brother but he seems to hate it that she can, if that meakes sense. He just won't play or even share the same space as her now.
So, long post, but is this typical for his age? will it get better? will DD be affected by it, or will she not remember anything? doesn't seem to bother her as she usually laughs, but I'm a olympic-standard worrier!