Its called Small Bump by Ed Sheeran and im pretty sure its about a child but im not actually sure!

You're just a small bump unborn, in four months you're brought to life, You might be left with my hair, but you'll have your mother's eyes, I'll hold your body in my hands, be as gentle as I can, but for now your scan of my unmade plans, A small bump in four months, you're brought to life [another version:] A small bump in four months, you'll open your eyes
[Pre-Chorus:] I'll whisper quietly, I'll give you nothing but truth, [another version:] I'll hold you tightly, I'll give you nothing but truth, If you're not inside me, I'll put my future in you
[Chorus:] You are my one and only. You can wrap your fingers round my thumb and hold me tight. Oh, you are my one and only. You can wrap your fingers round my thumb and hold me tight. And you'll be alright.
[Verse 2:] You're just a small bump unknown, you'll grow into your skin. With a smile like hers and a dimple beneath your chin. Finger nails the size of a half grain of rice, And eyelids closed to be soon opened wide A small bump, in four months you'll open your eyes.
[Pre-Chorus:] And I'll hold you tightly, I'll give you nothing but truth, [another version:] And I'll hold you tightly, I'll tell you nothing but truth, If you're not inside me, I'll put my future in you
[Chorus:] You are my one and only. You can wrap your fingers round my thumb and hold me tight. Oh, you are my one and only. You can wrap your fingers round my thumb and hold me tight. And you'll be alright.
[Bridge:] You can lie with me, With your tiny feet When you're half asleep, I'll leave you be. Right in front of me For a couple weeks So I can keep you safe.
[Chorus:] 'Cause you are my one and only. You can wrap your fingers round my thumb and hold me tight. You are my one and only. You can wrap your fingers round my thumb and hold me tight. And you'll be alright.
[Verse 4:] You were just a small bump unborn for four months then torn from life. Maybe you were needed up there but we're still unaware as why.