5 months.

I had my little girl almost 5 months ago. ever since then, ive just felt completely different. at first, i never really had breakdowns. just kinda overthinking things. now i get mad over the littlest things and i upset myself over the simplest things. i have break downs whenever i can find alone time and i feel as if its just getting worse. i constantly feel like im not doing enough for her or if im not enough. is this normal, will it pass?