Verse 1
Bm             F#                    D
 Oh baby, baby How was I supposed to know
    Em                    F# 
That something wasn't right here
Bm             F#                        D
 Oh baby, baby I shouldn't have let you go
Em                    F#
And now you're out of sight, yeah
Bm                  F#
Show me how want it to be
        D                     Em        F#
Tell me baby 'cause I need to know now, oh because
Chorus:
Bm                F#
 My loneliness is killing me (and I)
D                 Em
 I must confess I still believe
Bm                     F#
When I'm not with you I lose my mind
         D
Give me a sign
Em          F#
Hit me baby one more time
Verse 2 (Chord pattern is the same as the 1st verse)
https://www.coveralia.com/acordes/----baby-one-more-time--boy-wunder-radio-mix--britney-spears.php
Oh baby, baby The reason I breathe is you
Boy you got me blinded
Oh pretty baby
There's nothing that I wouldn't do
It's not the way I planned it
Show me how you want it to be
Tell me baby 'cause I need to know now, oh because
Verse 3
Bm                     F#           D      Em  F#
Oh baby, baby how was I supposed to know
Bm                 F#                    D   Em  F#
Oh pretty baby, I shouldn't have let you go
F#           Bm                    F#                D
  I must confess, that my loneliness is killing me now
          Em     F#          Bm
Don't you know I still believe
                  F#
That you will be here
             D
And give me a sign
Em           F#             Bm (Strum it slow)
Hit me baby one more time
Not completely convinced ive got the last bit right but there you go....