3 Budgie Babies, 26, 27, & 14 Days Old, Unsure If Little One Is Fed?

[Bonnie 0]

I'm new to the forum.  I'm not a breeder, or shower, just a budgie and bird lover.  I have now 6 budgies (which includes the 3 babies) and an African Grey.  I have not had babies prior to this, and I am concerned and not sure how to tell if the mama and papa are feeding the youngest baby anymore.  The two older now pull themselves up on the ledge of the breeding-Nest box and poke their heads out to be fed there.  I have not seen the mother or father go into the box and actually feed the tiny baby. When either hops in they seem to leave right away, nor do they hop in as often now that the two bigger ones are setting up on the ledge.  I'm not sure what do do about making sure the little one is getting fed.  I have not done any hand feeding, mama and papa are very attentive to feeding the two older ones.  I don't want to do anything that will hurt the little one.  Can anyone please help with my concerns?  Thanks in Advance for any suggestions.

Bonnie