The yellow here made me think of Gold....(yellow gold).
Perhaps, God was revealing to you that you were in the process of being refined and clothed in something precious and valuable. Perhaps, He was revealing to you that he was raising you up and trusting you with a gift. (baby) It makes me think of not despising the day of
small things. It seems you have seen the progresion of him raising you up (platform) and trusting you with a gift that was small at the beginning...but as you have went through the refining process...you have come out pure (He is looking for a bride without spot or blemish).
During this process and time of being refined..this gift that God has birthed in you has grown. A toddler speaks to me of something that God has birthed that has begun to flourish and mature and is no longer the infant, that in the beginning could only handle milk but is now partaking of solid food. In other words, the mature things of God.
Trash all that does not apply or bear witness. As with all symbols...there is never an absolute or pat meaning that applys 100% of the time...but this was an awesome vision/ visions, none the less!! God bless you!!