Baby-food compositions comprising about 5% to about 25% egg-yolk solids and an acidulant in an acceptable, shelf-stable, baby-food preparation is disclosed. A base station includes an anchor module, a context information module, and a transmission point module. If the model is not acceptable, additional data is added to the data subset and the first parameter estimation algorithm is repeated for the aggregate data subset. Preferably, the guide has an opening for the center conductor, which is viewable to a user during attachment until the center conductor enters the opening. The composite is adapted for bonding to a substrate layer. The second layer is unattached to the first layer along a second portion to form an opening to the cavity to receive at least a portion of a hand to enable a person to perform a self-examination via the enclosures of the first layer.