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Here is a link that I have been using to plot DS's growth. It is the same chart that most doctors use, and this way you can see how your LO is doing. I think it will be a nice keepsake to print out once it is completed.
https://www.mybirthcare.com/favorites/babygrowth.asp
A link to the CDC's growth charts:
https://www.cdc.gov/growthcharts/who_charts.htm
Re: Online growth chart
A link to the CDC's growth charts:
https://www.cdc.gov/growthcharts/who_charts.htm