Narrow line Seyfert 1 galaxies (NLS1s) usually do not host relativistic jets and the detection of their γ-ray emissions is rarely reported. Evidences for strong relativistic beaming effect have been found in all γ-ray NLS1s to date and hence their jets are believed to be closely aligned. In this work we perform a systematic analysis of 7-year Fermi Large Area Telescope (LAT) data of 18 steep radio spectrum NLS1s (S-NLS1s) and report the first two detections of γ-ray emissions in this class, increasing the total number of known γ-ray NLS1s to 9. A strong and stable γ
Nearby in the stack
-ray signal (over 8
σ
) is produced by SDSS J144318.56+472556.7, and a significant
γ
-ray emission (4.5
σ
) of SDSS J130522.74+511640.2 has been detected in a monthly flare in November 2013. A thorough investigation of their multiwavelength properties from radio to X rays has been performed, finding no significant variability. Along with their spectral energy distributions and the radio morphology, these facts strongly suggest that these two sources harbor mis-aligned and possibly underdeveloped relativistic jets, which provides valuable targets to reveal the formation and evolution of relativistic jets under extreme circumstances.