In-depth reviews guided by a Pediatrician

Grownsy Fast 5-in-1 Review

Affordable warmer with simple controls but below average performance
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Price:   $29 List | $20 at Amazon
Pros:  Inexpensive, easy to clean, simple to use
Cons:  Inefficient, difficult to understand instructions, no auto-shutoff
Manufacturer:   Grownsy
By Abriah Wofford ⋅ Senior Review Editor  ⋅  Oct 8, 2020
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#11 of 12
  • Warming Efficiency - 25% 5
  • Ease Of Use - 30% 4
  • Health/Safety - 40% 6
  • Ease of Cleaning - 5% 5

The Skinny

The Grownsy Fast 5-in-1 is a product that has multiple settings for heating your baby's food at a convenient speed. It can also warm baby food and act as a sterilizer for bottles or pacifiers. Utilizing both steam and water bath technology, this affordable warmer packs in a lot of versatility. However, during testing, we found that all of its functions perform slightly below average compared to other products. For these reasons, we were less than impressed with the overall performance of the Grownsy, and we recommend checking out other bottle warmers before making your final decision.

Compare to Similar Products

Our Analysis and Test Results

Founded in 2015 in Los Angeles, California, Grownsy is a company that has a small selection of baby products designed to simplify the parenting process. They make two other bottle warmers with varying capabilities. The Fast 5-in-1 is the most basic option offered.

Performance Comparison

The Grownsy can be used with or without the plastic lid.
The Grownsy can be used with or without the plastic lid.

Health and Safety

The Grownsy Fast earned an average score for health and safety. It has the option to heat via water bath or steam, depending on the rate you want your milk to warm. Grownsy recommends the water bath function for a slow and steady method, which we also prefer. When using this setting, the milk temperature never rose above 90F; however, it took a full 12 minutes to get there. We think this is much longer than most parents will want to wait, and many may find it tempting to use the fast warm function. If you choose to go this route, you must be very attentive. In our tests, the temperature quickly rose to the ideal 99F. However, if left for just a few minutes too long, the milk soon jumps to well above 104F, at which point breastmilk will start to lose essential nutrients. At the end of our 12 minute test period, the highest recorded temperature was nearing 160F. Much too hot to be safely handled and past the point of nutrition degradation. Without a beep or auto-shutoff alert, you may end up wasting a full bottle of milk.

The Grownsy has a simple dial operation with symbols representing different warming cycles.
The Grownsy has a simple dial operation with symbols representing different warming cycles.

Ease of Use

With only one dial, you would assume that operation would be simple. However, the symbols are not very explicit or intuitive. We found the instructions to be full of grammatical errors and misspellings, making them very difficult to follow overall. We were scratching our heads trying to figure out which setting to use, how much water to fill, and when to remove the bottle. The max fill line is in Chinese, and there is no timed shutoff and no audible signal to let you know when a bottle is ready. There is only a safety shutoff to prevent the machine from heating when there is no water left.

The Grownsy was one of the slowest products when it came to warming 400ml of milk in a glass bottle.
The Grownsy was one of the slowest products when it came to warming 400ml of milk in a glass bottle.

Warming Efficiency

We put each machine through multiple rounds of heat testing to measure their efficiency and functionality. The Grownsy had a below-average warm time. It took 12 minutes to reach 90F when following the manufacturer's recommended settings. There is no auto-shutoff, but at this rate, parents will likely take the bottle out well before there is a risk of overheating.

A chemical descaler is included when you purchase a Grownsy bottle warmer.
With a total of three parts  the Grownsy is relatively simple to clean.

Ease of Cleaning

The Fast bottle warmer has 2-3 parts that need cleaning, depending on the warming method you use. The cleaning instructions are minimal, only noting to let the warmer cool and then wipe it with a damp rag after use. The removable parts may be hand-washed, but there is no statement noting whether they are dishwasher safe. You should descale every four weeks, and a chemical descaler comes with the package to get you started. Grownsy notes that you can also descale with a white vinegar solution. However, the instructions are crammed with grammatical errors and confusing sentences, turning a simple process into a complicated experience.

Manufacturer Video

Abriah Wofford