Welcome to the forum and a very nice gun for your 1st post! Yes it's a Baby Chiefs and the smooth ramp sight would be the 2nd variation sight introduced 1952.
EARLY "Model .38 Chiefs Special" (collector nickname Baby J frame):
1950, Oct 27, 1st shipped #6 - Introduction of the J frame Chiefs Special 5 screw, longer frame window than 'I' frames, 'I' frame size grip and trigger guard, with half moon front sight, satin blue finish and left hand extractor rod thread. Pre Magna Service stocks and standard latch for the 1st 90 or so only, followed by the 1st style flat latch and Magna stocks. 1st 3" slim barrel Dec 1950. Latest reported round sight #116XX, shipped 4/52.
1952 - Introduce ribbed barrel with smooth ramp front sight, otherwise same as above; earliest observed #2945 and latest currently known #12340, (12041 earliest observed with new coarse checkered hammer, #45963 highest known with fine knurled hammer); then came the serrated ramp sight, lowest known #6541, and the square butt option on the 'Baby J' c. #21342 in 1952 with Magna Stocks on both rd and sq butts. Will still have 1st style flat latch up to at least the 26,000 range, then changed to 2nd style flat latch. Steel Babys reported as high as the #33,000 to #36,600 range and shipping in 1953. Highest Baby known #45963 but last thought to be in the high 40,000 range. The SCSW shows a Baby J Airweight thought to be one of only a handful of non-production R&D guns.