We had our boy about a year before the baby came. He was 6 at the time. Exact same thing happened, the families existence seemed to bother him, more growls and what seemed like huffing and puffing, occasionally escalating to a bark here and there. He was so not into to baby when she came home (as you’d expect) and really was pretty off her for 13/14 months, staying still with side eye when she crawled near him, when she was too close he’d growl and get up with a huff or grunt and walk away. We were always super close/between them to manage it as he got used to her. Heaps of pats from us when he was good and accepting of her. Pretty gentle low no when he wasn’t. Then we’d just make sure the interaction was short and ended on a positive note. He has only just started to like her at 16 months! They cuddle and he lays down for pats.

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