Weight limit
The maximum weight of a child that the swing can support without negative consequences in any position and in any mode of operation. A heavier child should not be placed: even if it does not break immediately, there is no guarantee that this will not happen at some point later, with unpleasant consequences for the child.
Harness type
— Three-point. The classic version has three harnesses, one between the child's legs and two in the waist area, which come together in a buckle on the abdomen; the design may vary, but the principle of fixation (from below and around the waist) is always the same. In general, such harnesses provide a medium degree of safety, and in most cases they are sufficient.
— Five-point. In fact, it is a three-point system (see above), supplemented by a pair of harnesses running to the abdomen through the shoulders. This system provides the highest degree of safety available today.
Melodies / sounds
The music box has melodies and many of them have additional sounds (nature, rain, sea, etc.). The greater the range of songs stored in the device's memory, the greater the variety for the child and the greater the probability of finding the one with which the child will fall asleep, eat, play, etc.
More features
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Timer. A timer that switches off the automatic rocking mechanism (refer to "Automatic rocking") after a certain time. Thus, knowing the approximate time your baby falls asleep, you can set the timer and not worry about the rocker continuing to rock unnecessarily while your baby sleeps.
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Removable table. The presence of a removable table top in the design of the swing. Such a swing can play the role of a high chair; in addition, the table top can be useful for games.
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Player connection. A function similar to a music box (see above) — with the difference that the sound source is not the memory of the box itself, but a player connected to the swing.
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Vibration unit. The mechanism that provides the vibration of the seat unit — this plays the role of a massage for the child, and also creates a relaxing effect.
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Arc with toys. A structure in the form of an arc or bracket above a swing, on which various toys are suspended. They can be used to play or to distract the baby (for example, to stop crying). The arcs are often made removable, and the brackets are also swivel.
— Lighting effects. Multi-coloured flashing lights that can cheer up or distract the baby (especially in combination with sound).
Finishing material
The material with which the swing is finished externally. The absolute majority of modern models use fabric — this material is soft, pleasant to the touch, easy enough to clean and allows you to create different colors.