"birthweight" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "birth",
        "3": "weight"
      },
      "expansion": "birth + weight",
      "name": "compound"
    }
  ],
  "etymology_text": "From birth + weight.",
  "forms": [
    {
      "form": "birthweights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "birthweight (countable and uncountable, plural birthweights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Premature infants often have a very low birthweight.",
          "type": "example"
        }
      ],
      "glosses": [
        "The amount that a baby weighs at the time of birth."
      ],
      "id": "en-birthweight-en-noun-fO688nIs",
      "links": [
        [
          "weigh",
          "weigh"
        ],
        [
          "birth",
          "birth"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "birthweight"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "birth",
        "3": "weight"
      },
      "expansion": "birth + weight",
      "name": "compound"
    }
  ],
  "etymology_text": "From birth + weight.",
  "forms": [
    {
      "form": "birthweights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "birthweight (countable and uncountable, plural birthweights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms with usage examples",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "Premature infants often have a very low birthweight.",
          "type": "example"
        }
      ],
      "glosses": [
        "The amount that a baby weighs at the time of birth."
      ],
      "links": [
        [
          "weigh",
          "weigh"
        ],
        [
          "birth",
          "birth"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "birthweight"
}