Ok, I joined Bernat...found your pattern, and saved the PDF pattern.
It looks to me like your armhole has been decreased wrong.
For size 6 months, this is what I perceive the pattern to be saying for the first FRONT:
Cast on 52. Work g st for 2".
Commence shaping as follows:
RS FACING> Row 1: Dec 1 at front edge [COLOR=Red](51 st remain)[/COLOR]
RS Rows 3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33: Dec 1 at front edge [COLOR=Red](35 st remain)[/COLOR]
RS Rows 37,41,45,49: Dec 1 at front edge [COLOR=Red](31 st remain)[/COLOR]
WS Row 50: bind off 7 [COLOR=Red](24 st remain) [/COLOR] (yes, that's it for armhole shaping)
Now continuing with the FRONT EDGE shaping:
RS Rows 51,55,59,63,67,71,75,79,83,87,91,95: Dec 1 at front edge [COLOR=Red](12 st remain)[/COLOR]
Continue with no further decreases anywhere until the piece measures [COLOR=Blue]4 3/4"[/COLOR] [U]from the armhole bindoffs[/U]. End by working a RS row. Then bind off with a WS facing.
NOTE: sometimes [COLOR=Blue]the length[/COLOR] will be satisfied by the time you've worked Row 95. Be sure to measure. This would be a garment where ROW GAUGE is important not to be too tall.