Ay, first things first, anak, please bring baby to the doctor or clinic na para ma-check properly, lalo na kung nag-spread or nag-itch ang baby. Better safe than sorry with skin stuff sa babies, diba?
Hindi namin kaya i-confirm from photos lang kung ano talaga yun, pero ang best move talaga ay may proper check-up para ma-identify agad at ma-treat correctly. A few of my mum friends had similar concerns din, at ang doctors talaga ang nag-guide sa kanila on what to do next. Sending you love, mamsh, first time mom worries are real!